71 LT-1 - Diagnosing Holley Leak

[Mick D.]

Hi friends,

I solved my leak for a while by tightening the fuel inlet fittings and it was leaking quite a bit at that point. Now it leaks less, but from the front.

https://youtube.com/shorts/SK8zLcdUlZc?feature=share

https://youtube.com/shorts/csfVpKZ5AEo?feature=share

The 2nd video is after I shut it off.

Any ideas which tightening I need to solve this - or do I need new gaskets?

Appreciate any input,

Mick

[Mick D.]

Re: 71 LT-1 - Diagnosing Holley Leak

I should add, this seems to go away after it has warmed up and driven around the block - either that or it is so little that it just evaporates from engine heat. After a trip around the block (10 minute drive) I did not see any leaks whatsoever on return or after stopping.

[Owen L.]

Re: 71 LT-1 - Diagnosing Holley Leak

Difficult to tell exactly but it appears it could be the accelerator pump diaphragm/lever cover or perhaps the bowl screw right above it. Near the end of the second video, it seems like there's right to left movement of the gas to the corner before it drips off. For this reason, I'm leaning toward the bowl screw.

The bowl screws should have a sealing washer/o-ring right under the head. For my Holley, I find that these screws can always be snugged a quarter to half turn - they just seem to self loosen a tad over time. If it's the accelerator pump cover, the only way to adequately tighten the cover is to remove the carb. The pump is simple and inexpensive to swap out in case it's the culprit.

[Mick D.]

Re: 71 LT-1 - Diagnosing Holley Leak

Hey Owen - Thanks for looking, I will check those screws. It would seem that as I chase the leak it is moving to the path of least resistance

Difficult to tell exactly but it appears it could be the accelerator pump diaphragm/lever cover or perhaps the bowl screw right above it. Near the end of the second video, it seems like there's right to left movement of the gas to the corner before it drips off. For this reason, I'm leaning toward the bowl screw.

The bowl screws should have a sealing washer/o-ring right under the head. For my Holley, I find that these screws can always be snugged a quarter to half turn - they just seem to self loosen a tad over time. If it's the accelerator pump cover, the only way to adequately tighten the cover is to remove the carb. The pump is simple and inexpensive to swap out in case it's the culprit.

[Mick D.]

https://youtube.com/shorts/rge3vQEvUWc?feature=share

Difficult to tell exactly but it appears it could be the accelerator pump diaphragm/lever cover or perhaps the bowl screw right above it. Near the end of the second video, it seems like there's right to left movement of the gas to the corner before it drips off. For this reason, I'm leaning toward the bowl screw.

The bowl screws should have a sealing washer/o-ring right under the head. For my Holley, I find that these screws can always be snugged a quarter to half turn - they just seem to self loosen a tad over time. If it's the accelerator pump cover, the only way to adequately tighten the cover is to remove the carb. The pump is simple and inexpensive to swap out in case it's the culprit.

[Owen L.]

Re: 71 LT-1 - Diagnosing Holley Leak

Glad it worked. I've considered using a Loc-Tite formulation on them but just haven't investigated which one or even if it's advisable.