martys76

350 sb car will bog out a 3500 rpm (almost die)

some times but act normal for days

die out again completely no fuel to carb

had it towed home and now starts

took line to fuel pump off and fuel runs out

took fuel filter out and the little white thing with the spring attached to it was displaced.

might this be a fuel pump problem never had heard of a fuel
pump being intermittent.

by the way it is still a mechanical fuel pump

any idea what my problem might be

leadfoot4

Your avatar says "martys76". Is your car a 1976 model? If so, have you checked the condition of the fuel lines, both rubber and steel, between the fuel tank and the fuel pump? Steel lines not all rusted, and rubber lines not soft and collapsing?

henrikse

My thought is rubber fuel line. They go inside the line and collapse.

CanadaGrant

You say you took the fuel filter out and it had a little white thing with a spring attached. If you are talking about the inlet filter in the quadrajet and it has a ball with a spring behind it you have probably found your problem. Napa sells those anti drain back filters and they fail regularly. The ball causes a restriction and you run out of fuel as they stick and jam in the closed position. Use a normal filter that is open on one end with no ball and make sure the open end is at the fuel line inlet and not turned around. Below is one of the bad ones. You can see the ball is larger than the surround and jams up restricting fuel. Under load the carb literally runs out of fuel. If this is what you have, get one without the check ball or remove the ball and make sure the opening is facing the fuel line.

martys76

i put a new one and see what happens
gona make sure i have tools with me next time

vincegward

I had the same thing happen to my 77. The problem is the two rubber fuel lines from the fuel pump need replace.