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Old 07-18-2020, 04:44 PM   #1
Kiwi73
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Default Holley 94 question

Our brigade is restoring a 1942 3 ton Jailbar fire truck. Iíve just got it running but fuel leaks from pump and carb. Have rebuilt pump -thatís now good. But in the middle of rebuilding the carb and itís missing a check valve (part# 9594) under the accelerator discharge nozzle (part#9577). Can anyone tell me a) whatís the missing part do and b) is it ok to run without it? Iím reluctant to put it back together without knowing the implications of leaving this check valve out...thanks heaps in advance!
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Old 07-18-2020, 06:26 PM   #2
Brian
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Default Re: Holley 94 question

Chances are you have it...it looks like the needle out of the fuel inlet needle valve assembly
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Old 07-18-2020, 06:34 PM   #3
Kiwi73
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Default Re: Holley 94 question

Thanks Brian, itís definitely not in the carb when I pulled it apart. I have sourced another but really want to know whatís its function. Is this a mod that people do in these carbs?
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Old 07-18-2020, 07:02 PM   #4
scicala
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Default Re: Holley 94 question

If the check weight isn't in there, then it's possible to siphon fuel out of the accelerator pump discharge nozzle (#9577), which would leave the channel dry, and possibly stumble/backfire after you stop and try to take off again.

Sal
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Old 07-18-2020, 07:28 PM   #5
Kiwi73
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Default Re: Holley 94 question

Quote:
Originally Posted by scicala View Post
If the check weight isn't in there, then it's possible to siphon fuel out of the accelerator pump discharge nozzle (#9577), which would leave the channel dry, and possibly stumble/backfire after you stop and try to take off again.

Sal
Brilliant! Thanks for the info. Iíll wait for the new part before reassembly😀
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Old 07-18-2020, 08:18 PM   #6
Charlie ny
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Default Re: Holley 94 question

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That check needle is factory.........the needle is brass and not to be confused with
the fuel inlet needle. Without the needle in place the vacuum inside the carb will
cause fuel to be siphoned out thru the accelerator pump discharge 'squirter' at all
times......not just when the pump is depressed.
Charlie ny
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Old 07-18-2020, 08:46 PM   #7
Kiwi73
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Default Re: Holley 94 question

Quote:
Originally Posted by Charlie ny View Post
That check needle is factory.........the needle is brass and not to be confused with
the fuel inlet needle. Without the needle in place the vacuum inside the carb will
cause fuel to be siphoned out thru the accelerator pump discharge 'squirter' at all
times......not just when the pump is depressed.
Charlie ny
Thanks Charlie! This all makes sense now as when I had it running it was impossible to idle properly too. Check valve should be here to tomorrow...
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