Double pumper Holley leaking from under the squirter - Yellow Bullet Forums
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Old 10-06-2019, 05:32 PM   #1
Shoedoos
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Default Double pumper Holley leaking from under the squirter

Rebuilt Holley 390 double pumper, completely stripped and back together with new consummables. Floats set so they dribble out sight plugs when rocked, accelerator pumps set to squirt immediately, white pump cam.

Fire up and the thing idles nicely, give it a squirt, no stumble and a good stream from the primary discharge nozzle (#35). The nozzle starts out nice and dry underneath, then its like a well overflows and it weeps (very wet) from underneath the nozzle. After a couple of seconds the wetness drys and engine returns to a dry idle. This wetness soaks the top of each primary throttle bore in the immediate vicinity of the discharge nozzle.

I initially thought the thing was not tight, so nipped it up a bit more, tested again same thing, got to the point I wasn't going to tighten anymore for fear of stripping thread. Take off the nozzle and replace the two gaskets (top/bottom) - fire up and same symptoms.

Tried a different discharge nozzle (#31) from another carb, new gaskets, same issue.....the weeping happens if I just touch the throttle, whack it or if I roll it through into the secondaries. The secondary squirter stays dry throughout..anybody have ideas?
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Old 10-06-2019, 06:36 PM   #2
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Default Re: Double pumper Holley leaking from under the squirter

Needle under squirter may be stuck!
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Old 10-06-2019, 09:15 PM   #3
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Default Re: Double pumper Holley leaking from under the squirter

I'm thinking that could be part of the problem as I had to blow it out of its passage when removing during the rebuild. But, why would the fuel well up and leak from under the discharge nozzle? I would think the fuel would continue to squirt through the nozzle's discharge holes?
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Old 10-06-2019, 09:39 PM   #4
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Default Re: Double pumper Holley leaking from under the squirter

two different gaskets, one under squirter and one under screw . did you mix them up?
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Old 10-06-2019, 09:45 PM   #5
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Default Re: Double pumper Holley leaking from under the squirter

No, not that I am aware, one is tapered, the other flat.....
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Old 10-06-2019, 10:44 PM   #6
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Default Re: Double pumper Holley leaking from under the squirter

Make sure that there isn't a partial piece of an old gasket still on the main body, creating an uneven surface.
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Old 10-06-2019, 11:09 PM   #7
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Default Re: Double pumper Holley leaking from under the squirter

will check again, it is a possibility, I did remove the old gasket on the first go round....
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Old 10-07-2019, 08:55 PM   #8
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Default Re: Double pumper Holley leaking from under the squirter

Quote:
Originally Posted by wolf Wengler View Post
two different gaskets, one under squirter and one under screw . did you mix them up?

The top and bottom gaskets arent the same?


Are you sure it is weeping and not just running down the nozzles along the body of the squirter and onto the gasket?
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Old 10-07-2019, 09:14 PM   #9
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Default Re: Double pumper Holley leaking from under the squirter

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Originally Posted by wingnutks View Post
The top and bottom gaskets arent the same?
see #5
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Old 10-07-2019, 09:20 PM   #10
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Default Re: Double pumper Holley leaking from under the squirter

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Originally Posted by wolf Wengler View Post
see #5
What type of carb is this that has different gaskets for under and on top of the pump nozzle? I dont think I have ever seen that.
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Old 10-07-2019, 09:40 PM   #11
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Default Re: Double pumper Holley leaking from under the squirter

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Originally Posted by Shoedoos View Post
No, not that I am aware, one is tapered, the other flat.....
Its been awhile but I think its tapered after its been used .

I think they are flat when new .

I could be wrong ....... its been awhile .
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Old 10-07-2019, 09:41 PM   #12
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Default Re: Double pumper Holley leaking from under the squirter

I've seen the different gaskets but rarely use the tapered one. Never used to be that way and it's thick enough you loose a thread on the shooter screw....nah I'll stick with old school even if I have to buy extra gaskets from BLP.
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Old 10-07-2019, 10:07 PM   #13
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Default Re: Double pumper Holley leaking from under the squirter

I have nice fresh versions of the tapered and the flat gaskets, yes I can try a flat gasket up top to discount that possibility but don't think its the issue.

As far as the weeping is concerned, I should have taken a video to show you guys. It definitely isn't running down from the top, it is weeping out from underneath....
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Old 10-07-2019, 10:33 PM   #14
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Default Re: Double pumper Holley leaking from under the squirter

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Originally Posted by boostedbowtie View Post
Its been awhile but I think its tapered after its been used .

I think they are flat when new .

I could be wrong ....... its been awhile .
Yea. This is what I was thinking.
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Old 10-07-2019, 11:10 PM   #15
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Default Re: Double pumper Holley leaking from under the squirter

Surely I am not the first person to ever have this issue? Any other leads? Yes I will try flat gaskets, yes I will check the mounting point for old gasket residue, yes I will check for burrs, yes I will check the needle underneath.....anything else I can look at?
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