I'm trying to find out if there's a cam lobe for a mechanical pump in an 88 tbi motor. It's been switched to carb and the intank pump went bad. We'd kind of like to not mess with getting in the tank again after this
CK5
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Is there a cam lobe for fuel pump in an 88 tbi motor?
- Thread starter shady
- Start date
Either way the block may not be drilled for the pushrod either. Easy enough to look
It looks like my 90 has a definite area where a lobe would be, clearly a raised lobe visible. but this is only me shining a light into the fuel pump pushrod galley. I can't tell you if there is a actual lobe there, or just a factory "blank" lobe, unground lobe, so to speak. I can't turn this engine over at the moment.
I've found it's hit or miss weather the block is drilled and the cam has a lobe on it. Also found out having the cover doesn't mean the block is drilled either.
The block is definitely drilled
If you are pulling the tank to put a pick up tube in, just put another electric in tank...
Or,if your only running carb,you could use one of these,mounted close to the gas tank...not sure if you'd have to remove the dead in-tank pump,these might pull fuel thru it OK ..
That last one is what we're doing I guess. I think it'd pull through the old pump just fine. He wants to make sure it never has to come down again. This will be the 3rd pump on this truck since I bought it and it only has like 6000 miles on it in that time frame. The last one that was put in was a Delphi or Delco, can't remember which, and it only has about 1000 miles of driving on it. But that was over a 3 yr period due to the tbi troubles and all that.
The pump they sell at orilleys to replace the one in that pic above is an Edelbrock that has 7psi and good for 400 hp. So we can turn the return line into a filtered vent and lose the regulator
The pump they sell at orilleys to replace the one in that pic above is an Edelbrock that has 7psi and good for 400 hp. So we can turn the return line into a filtered vent and lose the regulator
I'd stay away from the Mr.Gasket pumps...total P-O-S...had two fail I bought and friends who used them had their die in short order too..
Facet and Purolator made those square ones,they held up the best for me in the past--I have a round one like the one above that was on my diesel pickup when I bought it in 2003 and it still works fine--but an identical one I bought I used on a garden tractor died over the winter--it was working perfect when I parked it--come spring,it only clicked a few times,got quite hot,then nothing...I suspect ethanol in the gas killed whatever is inside that does the pumping--a bellows,or diaphram...I'm going to dissect it and do an autopsy on it..
The Facet design pumps use a nylon ball and solenoid to do the pumping ,so they are more resistant to alcohol...
Facet and Purolator made those square ones,they held up the best for me in the past--I have a round one like the one above that was on my diesel pickup when I bought it in 2003 and it still works fine--but an identical one I bought I used on a garden tractor died over the winter--it was working perfect when I parked it--come spring,it only clicked a few times,got quite hot,then nothing...I suspect ethanol in the gas killed whatever is inside that does the pumping--a bellows,or diaphram...I'm going to dissect it and do an autopsy on it..
The Facet design pumps use a nylon ball and solenoid to do the pumping ,so they are more resistant to alcohol...
If you keep replacing pumps there is a reason. Pays to use oem parts sometimes.
Over the counter auto parts pumps are the worst.
Over the counter auto parts pumps are the worst.
This one had the least amount of miles and was the oem.
When I switched to carb I did put a regulator on it and set the pressure that way. We still ended up using the regulator. It's pulling through the old pump because we needed it to run and run now. Runs fine. We did it this morning before he had to go to work. Set the regulator at 5.5. he plans on dropping the tank at a later date to remove the old pump and make a pickup tube. But we need to find an in-tank filter we can use first
When I switched to carb I did put a regulator on it and set the pressure that way. We still ended up using the regulator. It's pulling through the old pump because we needed it to run and run now. Runs fine. We did it this morning before he had to go to work. Set the regulator at 5.5. he plans on dropping the tank at a later date to remove the old pump and make a pickup tube. But we need to find an in-tank filter we can use first
What external pump did you use?
Noisy?
Noisy?
Why not just replace the sending unit with one for a carbed engine,that has the sock filter ?..
Sorta noisy.
langss
Registered Member
In my experience your 100% Correct, and the problem is not necessarily the pump. although all I have ever used were OEM. The problem lies in the fact that the pump is FUEL COOLED, so when you run the tank below lets say 1/4 or more, on turns or incline/decline or simply run out of gas, the pump may be out of the fuel for however long, so its not being cooled. Almost every pump I have ever changed showed signs of having been run hot or frankly just burned up.(connectors melted)So if you want the pump to live,it has to stay cool in the fuel.
langss
Registered Member
Well that's a pretty good safety margin. I sure wish I had that on all the Third Gen's I have dropped the tank on. Good Luck.Tank is a 40. And sending unit is for 25. So when it says empy there's 15 gallons in it, and it's always had gas added at about 1/4 on the gauge. Fixed now either way
