Fuel pressure is not controlled by the pump, but rather by the fuel pressure regulator.
SOURCE: 2004 ford E350 no power to fuel pump
put a test light on the ground wire to a 12v power source and see if the pump is grounded properly
SOURCE: Need to change fuel pump on my 2000 ford powerstroke
full details are in repair manual under fuel systems purchase it at local parts store.
SOURCE: Grind in Dana Differential
drain the fluid and refill with limited slip gear oil, add one bottle of friction modifier, ( this is very important) the noise is the clutches sticking.
SOURCE: 92 Ford F150 4.9L. starts good, idles rough, dies at slow speeds
4.9 litre ?? you having a laugh its a 10ton truck engine not a pick up -global warming machine,remove the pump/sender unit and check the gauze filter also look inside tank for a something floating around ,i think the idles is not a related problem to the vehicle losing power but their is a possibility you could have a problem with the little vac operated thing on the fuel injector line that allows the fuel through only when the engine is running
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