I have put 2 fuel pumps in this car that have failed in a weeks time.today i installed third and car will idle fine but will not accelerate.i have checked for gas at engine and it seems to be pumping but if pressure is right i assume is ok.
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Sounds like you may have fuel filter problem. you may want to check the pump and filters located in or near the fuel tank.
Go directly to the source ( Fuel Tank, Pump, Filters, Fuel Pressure Regulator and Injectors )
You may have water or grit in the fuel
Hope this helps
Not sure this helps but I have run into several Ford pick up trucks that will idle all day but the moment it was put into gear and accelerated it would die. Fix was a new fuel pump. Had enough pressure to idle but not to take the gas. Your question did not include a make or model but first thing would be to check the fuel pressure at idle and see if it drops an acceleration. it is possible to have pressure but not volume.
Well, they probably did put on either a bad fuel pump or should've done the relay.There is also a fuel pump REGULATOR that can cause a lot of trouble. Make them keep at it,since their work should be warranteed when they say they've fixed it. don-ohio
You vehicle is equipt with a fail safe device the oil pressure switch, the fuel pump will run as long as the oil pressure is okay if this switch has failed you experience extensive long cranking time the oil pressure switch activate the fuel pump replace that switch leave the fuel pump alone.
Can you raise the revs by gently pressing the pedal? That will largely eliminate the electrics or will it just not rev at all? Is the idling affected? Have you checked that the accelerator pump is working as it should, Is the mixture correct? (What did you turn up, the idle speed or the mixture? and is the timing advance working as it should? Is the fuel pump working properly? Make sure it's pumping enough fuel. Failing all that it could be contaminated fuel or a blockage. You say the carb is getting plenty of gas but it sounds like fuel starvation or excessive richness if you can get the revs up eventually. Disconnect the fuel pipe to the carb, put it in a deep bowl as you dont want it splashing all over the place and get someone to crank it. It should provide a steady good flow of fuel. Finally check all vacuum hoses/pipes for leaks