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"Water in fuel" 6,2 Diesel

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Espen88k5, Feb 3, 2001.

  1. Espen88k5

    Espen88k5 1/2 ton status

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    \"Water in fuel\" 6,2 Diesel

    I'v been getting this light when axcelarating. Like a good K5'r I have all the Haynes books, and my Diesel book says ther is now 1-2 gallons of water in the tank, and to remove the water by siphoning the tank via the siphoning feature on the sending unit. I have a 88 model and it also says this was a common feature after 83 and you can tell by a "purple" ground wire on the sending unit.

    Is there anyone here that have actually done this and can walk me through it?Will my 3" bodylift come in handy now that I probably have to remove the gas-tank? The temp outside is 14 Farenheith or -10C so Water in the fuel cant be good right? Otherwise the truck runs strong.


    <A target="_blank" HREF=http://www.espen88k5.coloradok5.com>http://www.espen88k5.coloradok5.com</A>
     
  2. MICHIGAN BLAZER

    MICHIGAN BLAZER 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    Is There any kind of "dry gas" you can buy to pour in your tank to eat the water. Not sure about diesel's at all....but it's COLD here too and i know your pain.......in the winter i do as little as i possibly have to in order for the vehicle to run!!

    <font color=red>MICHIGAN BLAZER
    <font color=green>89 Fullsize Blazer
    87 Cherokee
    65 IH Scout
     
  3. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    Re: \"Water in fuel\" 6,2 Diesel

    You shouldn't have to remove the tank...
    I place to check

    http://SK-15.coloradok5.com
    Roads? Where we're going, we don't need any roads!
     
  4. Gopherkiller

    Gopherkiller 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    If it runs good, I wouldn't worry about water in the fuel. Just keep putting "good" fuel in it. GOPHERKILLER
     
  5. Espen88k5

    Espen88k5 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    Thanks guys, but I think this is serious. The haynes states that all kinds of bad things can happen if left unatendet : Rust pierced tank, pipes, and destroyed fuelpump$$$.And if that doesn't kill it FUNGI and bacteria !! will surely finish the old girl off *Gulp*

    Is'nt there a diesel-doctor in the house?

    <A target="_blank" HREF=http://www.espen88k5.coloradok5.com>http://www.espen88k5.coloradok5.com</A>
     
  6. Espen88k5

    Espen88k5 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    Back on top!
    Need some "piece of mind" on this.

    <A target="_blank" HREF=http://www.espen88k5.coloradok5.com>http://www.espen88k5.coloradok5.com</A>
     
  7. chevy4x4

    chevy4x4 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    About 1 month ago I was reading a GM diesel book. I remeber it had some stuff on getting rid of water from the fuel but I didn't read it. The book was from a library and I returned it a few weeks ago. I might go to the library tomorrow and I'll look it up for you. I'll PM it too you.

    [​IMG]
    [​IMG]K5[​IMG]
     
  8. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    Re: \"Water in fuel\" 6,2 Diesel

    Read the Haynes book...do as it says...it should work. But before you start draining the tank check the wiring as it says in the Haynes manual!!! I have the "Haynes Diesel Engine Repair Manual".
    I think to purge it you basically stick a hose down the return tube and start removing. Make sure you have a large enough container....theres alot of Diesel in those tanks!!!

    SK-15
    J**P...it's whats for dinner!
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  9. Espen88k5

    Espen88k5 1/2 ton status

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    Re: "Water in fuel" 6,2 Diesel

    Thanks guys.
    I wonder if there is another sensor besides the tank one.? I dont get the WIF light when cornering or breaking, only when i putt my foot on it... makes me wonder if there is a sensor in one of the the fuel-filters, the Haynes Dieselbook jumps between 5,7 , 6,5 6,9 6,2 and 7,3diesel engines so I am a litle lost. I thought I had it (it showed a diaghram of a filter with a water removal-valve), but looked at the top of the page and it says all 7,3 engines so that wasn't it....
    Dangnabbit!!
    Anybody know for sure??


    <A target="_blank" HREF=http://www.espen88k5.coloradok5.com>http://www.espen88k5.coloradok5.com</A>
     
  10. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: \"Water in fuel\" 6,2 Diesel

    I have a Chiltons here. It says the 84-87 (my book only goes to 87) has an inline filter that acts as a filter, water separator, water detector, water drain, and fuel heater. Sounds like an important part. [​IMG]
    Does your Haynes recommend draining the tank? It looks like the Chiltons is saying the filter is where all the action is for this on the newer diesels. It say that on the older diesels there are two filters and water separators, one on the firewall (primary) ans one on the back of the manifold(secondary) Is this what your truck has or just the inline filter thats supposed to do it all?
    The book i have has a whole deal on how to change the fuel filter, drain the water and bleed the air out of the system. If you want I'll type it all out. (no scanner [​IMG])

    Rene

    [​IMG]
     
  11. Espen88k5

    Espen88k5 1/2 ton status

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    Re: "Water in fuel" 6,2 Diesel

    Thanks Rene.
    Yes I have the two filters. The one connected to the intake-manifoil towards the firewall sounds like it could handle all that buissness described. Could you please type off the steps for me. I have the steps for a Ford 6,9 and 7,3 L that basicly says; disconect battery, place container..yadayadayada. Then rotate the lever away from the housing to open valve. Let open for 15 sec or til clear fuel..dispose of liquid so and so.Back inside for Tea and biscets.
    If it is this simple I dont want to take it to a garage. I'm saving for lift and tires!!

    <A target="_blank" HREF=http://www.espen88k5.coloradok5.com>http://www.espen88k5.coloradok5.com</A>
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: "Water in fuel" 6,2 Diesel

    OK Espen, I'm going to give you verbatim what my manual says. This was the only reference to water in the fuel that I could find.

    379 Engine
    &gt;See Figures 17,18 and 19


    On 1982-83 models, there is a primary fuel filter attached to the firewall and a secondary fuel filter mounted to the back of the manifold. If it should be necessary to drain water from the fuel tank, also check the primary fuel filter for water and drain as outlined below.
    The 1984-87 engines use an inline type filter which acts as a filter, water separator, water detector, water drain and a fuel heater.

    1982-83 PRIMARY FILTER

    If it should be necessary to check for water proceed as follows:
    1. Open the petcock on the top of the primary filter housing.
    2. Place a drain pan below the filter and open the petcock on the bottom of the drain assembly. (Attach a length of hose to the petcock and direct the fluid below the frame).
    3. After all the water is drained from the filter close the petcock tightly.
    4. Replace the filter and fill with clean diesel fuel to prevent engine stalling.
    5. Close the upper petcock tightly.
    6. Start the engine and let it run briefly. The engine may run roughly for a short time until the air is purged from the system.

    &gt; If the engine continues to run roughly, check to make sure both petcocks are closed tightly.

    1982-83 SECONDARY FILTER


    1. Remove the fuel filter lines from the adaptor.
    2. Remove the fuel filter adaptor from the intake.
    3. Remove the filter.
    To install:
    4. Replace the filter and refill with clean diesel fuel to prevent engine stalling after start up.
    5. Install the fuel filter to the adaptor.
    6. Install the fuel filter adaptor to the intake.
    7. Install the fuel filter lines to the adaptor.

    1984-87

    1. Remove the fuel filler cap to release any pressure or vacuum in the fuel tank.
    2. Remove both bail wires.
    3. Use a suitable container and drain the fuel from the filter by opening the air bleed and water drain valve.
    4. Remove the fuel filter element.
    To install
    5. Install a new filter element.
    6. Install the bail wires.
    7. Close the drain valve.
    8. Install a 1/8 inch inside diameter hose to the air bleed port and the other end of the hose to a suitable container.
    9. Disconnect the fuel injection pump shut-off solenoid wire.
    10. Crank the engine for 10-15 seconds and then wait one minute for the starter motor to cool. Repeat until clear fuel is observed coming from the air bleed.
    11. Close the air bleed.
    12. Connect the injection pump solenoid wire.
    13. Install the filler cap.
    14. Start the engine and check the filter for leaks. Allow the engine to idle for five minutes.
    15. Check the fuel filter for leaks and repair as required.

    Thats all of it. I hope it was what you were looking for.

    Rene

    [​IMG]
     
  13. DieselDan

    DieselDan 1/2 ton status

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    Re: "Water in fuel" 6,2 Diesel

    OK Espen,

    Got enough info to get you going? I think you got the box style filter. Open the bottom drain cock drain off the water (then close). Disconnect the fuel solenoid wire (pink?) at the top of the injection pump. Have someone crank engine while you open the top (bleeder) valve on your fuel filter. Once fuel starts squirting out close the valve. Reconnect fuel solenoid. You should be OK, but you going to have to do this daily to get all that water out. Check what you drain and you can tell when the water is gone.

    Dan
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: \"Water in fuel\" 6,2 Diesel

    Once again, the GM Service manual comes to the rescue. Granted this is out of the 1982 Manual, but it should apply in your situation. The fuel tank is designed so that the water seperates out, and underneath some kind of plate. The fuel pickup is above that. There are two filters, the primary one being on the firewall, passenger side. The water in the fuel tank is drained/siphoned out by locating the tube that either ends midway up the framerail on the passenger side, or near the rear spring hanger. There were no pictures, but I would have to suspect either location is on the passenger side, towards the rear. The manual didn't get much more specific, just that that is how you drain the tank. It also did not differentiate between, C, K and 5/10/20/30 series either. Probably all the same setup.


    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  15. Espen88k5

    Espen88k5 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    wow, dident mean to make you write a book Rene[​IMG] Apreciate it! I think I will go the route of bleeding the "box-filter" on the fire-wall. it's still cold as hell here though, so I guess I'l wait til it warms upp a litle. Doesn't take long to drain both batteries in this cold.
    And I'l look for that tube Dorian, that was what my first impresion was from the Haynes too, some sort of siphoning feature, but there was no pictures to explain i or what it looked like.
    Thanks again!
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  16. K5 NUTT

    K5 NUTT 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    Espen....DieselDan is right on the money!!!

    Azblazer

    1979 K5
    1976 K5 Chalet
    1972 K10 Suburban
     
  17. pcorssmit

    pcorssmit 1/2 ton status

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    Re: \"Water in fuel\" 6,2 Diesel

    The first step is to buy a HELM manual. Then the Haynes and/or Chilton can be used to level the kitchen table, wipe your greasy hands on, etc. The best source I've found is www.factoryautomanuals.com. (Send me an email if this address is bad and I'll look it up for you at home.)

    If memory serves me correct, there is a procedure to drain the water from the tank using compressed air. I think it drains out the petcock located near the front hanger for the rear passenger side spring. It is detailed in the Helm manual.

    Water in Diesel fuel is very serious and should be drained sooner rather than later. It is VERY bad for the injection pump ($$$$). There is a sensor located in your fuel tank.

    If the light came on just after a fill up, I would make it a point to avoid this service station.

    Pete

    '83 K5, 350 TBI (ex 6.2), Dana 60/14 bolt, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  18. Espen88k5

    Espen88k5 1/2 ton status

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    Re: "Water in fuel" 6,2 Diesel

    Allright.. I am getting lots of good info here...Thanks

    First off, it's the diesel-filter connected to the manifoild that has the water-drain valve at the bottom, not the square box-filter on the firewall passanger side, right I'm guessing both need attention though.

    I will get a good look (3" bodylift) at the pipes going from the sending-unit on my fuel tank and see if there are any lines ending by the front spring hanger, pass side. If I can Siphon out the water from the bottom of the tank + clean out the filter's + blow compressed air from the primary box-filter back towards the tank with sending unit detached, that should = No more worries for a few years.

    Could you also hear me out on this:
    Why does not the WIF-light come on when braking or cornering? Only when pushing the trotle down to take a hill or speed upp? After I let of the pedal the light goes out again. And does the extreme cold we are having now ( 15 Farenh. or -10C with strong wind) have anything to do with me getting this signal (I'm thinking ice-slush in the tank or filter? ).

    I'l have a go this weekend and let you know how it turned out.


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  19. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: \"Water in fuel\" 6,2 Diesel

    Just a theory here, since the service manual doesn't have an in-tank view, but they talk of a seperator in the tank..it's probably just a flat plate with one end open, probably the rear of it, towards the back of the truck. Obviously when accelerating, it would all slosh to the back of the tank, and allow water to come forward to hit the sensor, wherever it may be. Either that or it could be the same thing wherever the other WIF sensors are, the transition on acceleration will always be towards the rear of the truck.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     

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