Re: Engine cuts out on highway & up hill...

Posted by HH56 On 2012/4/7 19:16:18

You mentioned the fuel pump and if still the original and not been touched that would be a good place to start. New gas can do a job on the old rubber and the valves can harden and not function well--if at all.

The rubber hose connecting the steel gas line on frame to fuel pump is also suspect. If that has gotten hard and inside lining cracked, a chunk can get caught in the flow and flex under the suction of a fast engine and act like a valve restricting the fuel.

If the tank was not taken off and cleaned, there might be some debris floating or rolling around and getting sucked into the pickup. That has been reported as a problem by many and also a clogged air vent hole in the gas cap.

There is a screen that can clog. The bottom can on the fuel pump is a reservoir of sorts and there are either mesh screens or a bunch of plates stacked together which act as a screen. Any chunks of rust in tank or line can lodge there and block things.

If you have the ceramic fuel filter near carb, those can get clogged very easily with tiny almost microscopic bits of rust. If the gas sat in one and evaporated, the varnish can also clog those so they pass air but not enough fuel. The engine runs fine at idle but get it going much faster and it acts much as you describe.