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Install Fuel Pressure Gage... can't stop it from leskin'?

Discussion in 'The Injection Section' started by blazerbones, Apr 8, 2007.

  1. blazerbones

    blazerbones 1/2 ton status

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    Hi all. I asked about this in the garage... but I thought maybe it was better here...

    I just installed CFM-tech's fuel pressure gage. I now have a leak where the stock fuel inlet line screwes into the CFM tech adapter (the piece that the gage mounts into). I tried original o-ring (it looked good)... small leak. I tried new o-ring... small leak. I tried progressively tightening the line in small incraments... small leak every time.

    I just picked up the replacement o-rings at AutoZone... multipack fuel injection o-rings... and tried using the one that matched stock.

    The inlet line looks good (double bump flare intact).

    Anybody else have this problem??? Any ideas?
     
  2. blazerbones

    blazerbones 1/2 ton status

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    tbi by the way (90 sub)... and I just examined the o-rings that produced a leak. They have a cut all the way around the Outer Diameter... hmmm.

    Maybe I got a bum fitting... I'll try the stock fitting again, and if it works with no leaks... send the CFM tech stuff back...
     
  3. camok5

    camok5 1/2 ton status Premium Member

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    Try hooking the fuel line back up without the gauge and adapter and see if it still leaks. I hope you didnt cross thread the throttle body because thats what I did and a tap for that size thread cost me 30 bucks. Also you could try using some teflone tape.
     
  4. blazerbones

    blazerbones 1/2 ton status

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    It's not leakin' from the throttle body to adapter... it's from the adapter to the inlet line (an o-ring does the sealing there...)

    I'll check it with the stock adapter tomorrow if I get a chance to confirm... I think maybe there is a burr in the CFM tech adapter that is damaging the o-rings.

    Thanks for the reply.
     
  5. jerbro

    jerbro Newbie

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    I had a similar issue with my 88 TBI when I put the fuel meter on it.

    I replaced the o-rings (that were pretty shot in the first place) and the problem went away. Keep in mind that you need to be pretty light on tightening those down. The o-rings should not be crushed. They should just be squeezed a little bit. I know that this is hard to gauge, but I accomplished this by tightening by hand until I couldn't - and then, with two wrenches, tightening it down another 1/2 turn or so. I could have done it a bunch more, but I was fearful of smashing the o-rings. This has worked well for me.

    Luck!
     

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