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When I start my truck I have to keep rapidly pumping accelerator to keep it running. If I stop pumping accelerator or put in gear it dies. how do I fix?
I have replaced both in tank fuel pumps and fuel filter
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if it has a carby ( you didn't bother to mention carby or EFI), have the carby overhauled as from your description, the accelerator and power sections of the carby are not working, Blocked jets or low float levels
if it is EFI have the fault codes read to check for MAF/VAF sensors and/ or heated oxygen sensor problems
your description indicates that the engine is not getting excess fuel to provide engine rpm acceleration be it either carby or electronic system
There is a switch in the airflow meter that keeps the fuel pump relay closed as long as there is airflow. With the meter unplugged, the pump should not run except when the key is turned to start. It would seem to me that you have a wiring issue. Try jumping the fuel pump relay so the pump runs whenever the key is on. (Remove the relay and jump the pump wire to the accessory wire--see top left diagram.) This defeats the safety feature but will keep the pump running.
your vacum leaks has alot to do with it have vacum leaks fixed auto parts store sells the correct size hose you need at a ver fair price fix vacum leaks first then see how it runs after thatcheck fluid level in transmission and change transmission filter
well you narrowed it down to a fuel problem. not sure about your model, but most cars have a fuel pressure regulator on the fuel rail to reduce un needed pressures. that could possibly be bad. its cylinder in shape and has a vacuum hose connected to it. check the hose and that unit.
Sounds like a large vacuum leak,low fuel pressure,fuel pressure regulator failure, idle air control valve stuck open,plugged fuel filter.Also check for good consistent blue spark at spark plugs or jumped timing chain.Hope this helps!
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