1969 C10 350 engine is bogging at freeway speeds only

[MarcellJ]

Thanks for the replies guys. I will act upon them all as I can.

I believe the fuel pump is good, because I removed the fuel line from the carb and bumped the engine.

The person holding the the container and fuel line I disconnected stated that the gas was flowing good. So I assumed the fuel pump was in working order.

[JJorgensen52]

Originally Posted by MarcellJ

Thanks for the replies guys. I will act upon them all as I can.

I believe the fuel pump is good, because I removed the fuel line from the carb and bumped the engine.

The person holding the the container and fuel line I disconnected stated that the gas was flowing good. So I assumed the fuel pump was in working order.

I've had several trucks where the pump will move fuel in the open like this, but it can't push enough pressure (6 - 8 psi for your carb I believe) to feed the engine under load because it's worn down. Mechanical pumps are so cheap it's almost preventative maintenance

[JonCheun]

I had this same issue with my 350 in my 68 c10. I wasn't getting enough fuel pressure. I put a fuel pressure gauge in the line right before it goes into the carb and it was only reading 3 or 4 psi when it should be 7-9. I replaced the electric fuel pump and it fixed it.

[MarcellJ]

Thanks guys! I've been unable to drive my truck to work this week. However, today I bought a fuel pump, and I can't wait to put it on.

Hopefully this will solve my problem. If it doesn't, at least I know that it's new.