Electric Fuel Pump, Carburetor Flooding

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Aug 4, 2024 | 01:03 PM

#16

truckeemtnfords

Logistics Pro

Joined: Nov 2006

Posts: 3,663

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From: Fallon,NV & Bainbridge OH

Floats are notorious for sinking. You said it started acting up, what was it doing?
There is usually only one needle and seat in a typical carb kit are you sure it wasn't the old one from when he rebuilt it?

Aug 4, 2024 | 01:39 PM

#17

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,283

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From: NM

Many of the new needles and seats in rebuild kits are poorly made and don't seat well. Check for burrs on the seat.

Holley makes a nice regulator, and what I like about it is that they sell replacement parts for it. Holley 12-804 regulator, 1 - 4 psi output (adjustable). They used to be a lot cheaper, but they are good quality.
https://www.summitracing.com/parts/hly-12-804

Aug 4, 2024 | 01:53 PM

#18

Bob2246

Thread Starter

5th Wheeling

Joined: Jun 2024

Posts: 33

Likes: 3

From: Poland, OH

Quote:

Originally Posted by hooler1

Yes that does happen. It may not be common but it happened to me with a brass float. If you pull the float off and shake it around a little can you find gas leaking out of it?

When I had it apart I did give it a shake, but didn't hear anything.

Quote:

Originally Posted by truckeemtnfords

Floats are notorious for sinking. You said it started acting up, what was it doing?

The truck stutters when I press on the accelerator pedal because the throttle body is receiving too much gas. After the first time this happened (above in this thread), I barely could step on the pedal, and had to just feather it in order to baby it home. After pushing it in the garage, I turned the key to run but didn't start it. The fuel pump ran, and I witnessed gas pouring into the throttle body and past the float bowl gasket almost immediately.

Today, after replacing the needle valve and seat, I replaced the card and ran just the fuel pump for about 15 seconds, and saw nothing out of the ordinary. I started it and let it run in the driveway for 5 or so minutes. Still good. Took it for a ride, and began to experience the same trouble after about an 1/8th mile. Again had to feather the gas to get it home.

Quote:

Originally Posted by truckeemtnfords

There is usually only one needle and seat in a typical carb kit are you sure it wasn't the old one from when he rebuilt it?

The parts looked new. I don't think they were previously used and taken out of service.

Aug 4, 2024 | 02:56 PM

#19

truckeemtnfords

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Joined: Nov 2006

Posts: 3,663

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From: Fallon,NV & Bainbridge OH

What ever was in the needle/seat that caused your flooding may now be in the jet(s) or another passage causing your issues. Maybe not but if crap got introduced into the carb a total inspection is warranted.

Aug 13, 2024 | 09:21 AM

#20

Bob2246

Thread Starter

5th Wheeling

Joined: Jun 2024

Posts: 33

Likes: 3

From: Poland, OH

I found that a gasket was missing between the inlet needle valve body and the float bowl wall. I re-assembled with that, and put a new float in since I bought one (the old float is still above water on my workbench). It seemed to run ok, but was still I apprehensive because of the gas that was spewing from the float bowl gasket when the malfunction occurred.

I installed a fuel pressure regulator, and set it to 3 psi (running). I assume that high fuel pressure from the electric fuel pump compromised the gasket(?).

Fingers crossed.

Thanks to everyone who offered suggestions.