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Re: Fuel pump work but gas hand dont how to fix that...
First of all, check all fuses. Next, check for loose grounds on the fuel tank. If there aren't any, or you get it tightened up, and it still doesn't show, you need a new fuel tank sender unit.
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Some fixya user told me a website reliable-store it is very good.. I used it to repair my shredder it had some spark issue which wasn't easily fixed. you can go there and try
incorrectly and half assed installed. putting a fuel pump in a chevy is very difficult and takes patients. most mechanics dont have that so go to another shop and make sure they fix the problem before you pay.
when the gas gauge does not work it is usaully the sending unit or the fuel sensor. in since its mostly the fuel sensor you will have to replace the fuel pump because i dont think they sell a fuel sensor sepretly if they do then just buy the fuel sensor.
A FORD EQUIPED WITH DUAL TANKS THIS YEAR MODEL HAS CHECK VALVES IN THE FUEL PUMPS .THE FUEL RUNS FROM THE REAR TANK WHEN IT IS POWERED ON TO A TEE AND INTO THE SAME LINE AS THE FRONT PUMP . THE PROBLEM IS AT THE BOTTOM OF THE FRONT FUEL PUMP THERE IS A CHECK VALVE ON THE FOOT AND IT IS NOT WORKING.WHILE THE TRUCK IS RUNNING WITH THE REAR FUEL PUMP ON IT IS PUMPING FUEL INTO THE FRONT TANK . IT WILL RUN OUT OF THE NECK WHEN IT IS FULL.THE FIX IS SIMPLE REPLACE THE FRONT FUEL PUMP. THEY DONT MAKE A CHECK VALVE REPLACEMENT I CHECKED I HAD THE SAME PROBLEM AS YOU.
There are a couple things here. In the first place if you can pump fuel with the pump off the engine and pumped by hand doesn't mean that it will pump on the engine. See the stroke on the engine is very short, it only moves like 1/4 inch. So you could have a bad pump even though you are pumping by hand. The gas cap, will have no effect on this model. Yes the pick-up tube has a filter on the bottom of it, and it could be stopped up. You can remove this unit up through the top of the tank, got to wiggle it and turn it sideways, and if you can find a used one( New ones scarce and expensive) by going to used parts place, and look for 1967 - 1972, they are all alike. Lots a luck in fixing this great ole truck.
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