Leaking Gas
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New User
Joined: Feb 2014
Posts: 2
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From: Missouri
Leaking Gas
Well I bought a 1979 F-250 Custom a couple months ago, and I've finally gotten time to mess with it. Honestly, I don't know much about engines and such..but that's why I bought the truck. I want to learn. 
I can get the truck to start just fine. It runs well, except that there is a small leak of gas coming from under the carburetor. I'm assuming the rubber gasket is bad, and it just needs to be replaced. I don't know if that's the real problem or where to start. Any help appreciated. Thanks!
I can get the truck to start just fine. It runs well, except that there is a small leak of gas coming from under the carburetor. I'm assuming the rubber gasket is bad, and it just needs to be replaced. I don't know if that's the real problem or where to start. Any help appreciated. Thanks!
Hotshot
Joined: Feb 2004
Posts: 10,756
Likes: 2,588
From: The Shenandoah Valley
Is it a 351m or 400 or 300 I-6 or 460?
Is it a stock Motorcraft 2bbl or 4bbl carb, aftermarket Holley 4bbl, or what?
When / under what circumstances are you seeing this leak?
Holleys and the MC carbsl use diaphragm accelerator pumps that can leak, power valves that can leak .... and Holleys often leak between carb main body or metering blocks and float bowls, and there's fuel line fittings that can leak. If floats are high, Holleys can also leak at float sight level plugs.
A picture would help.
Is it a stock Motorcraft 2bbl or 4bbl carb, aftermarket Holley 4bbl, or what?
When / under what circumstances are you seeing this leak?
Holleys and the MC carbsl use diaphragm accelerator pumps that can leak, power valves that can leak .... and Holleys often leak between carb main body or metering blocks and float bowls, and there's fuel line fittings that can leak. If floats are high, Holleys can also leak at float sight level plugs.
A picture would help.
Thread Starter
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New User
Joined: Feb 2014
Posts: 2
Likes: 0
From: Missouri
It is a 351M. It has a Holley 4 barrel. Not sure what size it is they drilled the holes bigger according to the guy I bought it from.
When the truck runs for a few minutes it starts to leak. It leaks just in the front right under the carb.
So if Holleys normally leak do I need to do anything about it or just leave it be?
I will put a picture up.
When the truck runs for a few minutes it starts to leak. It leaks just in the front right under the carb.
So if Holleys normally leak do I need to do anything about it or just leave it be?
I will put a picture up.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
It is a 351M. It has a Holley 4 barrel. Not sure what size it is they drilled the holes bigger according to the guy I bought it from.
When the truck runs for a few minutes it starts to leak. It leaks just in the front right under the carb.
So if Holleys normally leak do I need to do anything about it or just leave it be?
I will put a picture up.
When the truck runs for a few minutes it starts to leak. It leaks just in the front right under the carb.
So if Holleys normally leak do I need to do anything about it or just leave it be?
I will put a picture up.
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