1978 Ford F100 351M

I have had problems with the engine of my truck since I bought it. I have narrowed it down to a fuel problem and/or a carb problem. It is a 2 barrel carb.

The problem is that when I press down on the gas pedal while in drive it bogs out and dies unless I let go of the pedal. After it dies it is very hard to restart and dies quicker the next time it starts.

I have replace the fuel filter which I first thought the problem was, then I replaced the accelerator pump just now because I saw a small leak of gas coming from it but neither have seemed to stop the problem.

Appreciate any feedback as this truck is my daily driver.

 

Ive had a similar problem with it bogging down when hitting the gas. I replaced the fuel pump and all was well.

 

take it all apart an soak it in carb cleaner and rebuild it totaly

 

Ok do you have a link or pictures of the fuel pump?

I have asked mechanics over the phone and seem to have narrowed it down to the carb being bad. Which is going to be either overhaul the original or possibly buying a new carb. If it is the pump it would be a quicker and cheaper fix.

 

Have you checked to see if there is any fuel in the carb bowl right after it dies? If the fuel pump isn't working, the carb would be empty. After it stalls, take the air cleaner off and then move the Throttle on the carb, while looking down in the carb. If you see a fuel spray, that will tell you the fuel pump is most likely working.

I'm my experience, when the fuel pump quits working, it just quits completely, and doesn't cut in and out.

 

With the engine off and cool, look down the venturis on the carb while you pull the throttle you should see a squirt of gas down each of them. The squirt should happen immediately when the throttle moves. If you have no squirt the engine will lean out when you blip the throttle.

Just and idea of where to look.

 

I tried to get a picture of the fuel pump for you, but it's dark and I don't have enough hands to hold the light and the camera...

However, you can follow the fuel line out of the carb down to the top of the pump... on my 400 it's located on the driver's side at the front of the engine block, just behind the power steering pump. Not sure if it's the same on the 351.

And wouldn't ya know it when I popped the hood on my truck to try and get a photo, I found a small leak in the upper radiator hose... it's always something!

 

I found the pump, it was on the driver's side front of the engine btw. I have talked to mechanics and feel like the pump is most likely the problem and bought a new pump as well as a new filter to hopefully fix this issue.

I appreciate the help and hopefully by this time tomorrow it'll be fixed.