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The van might run for half an hour then start and die over and over again for five minutes. I can make it run fine jumping the fuel pump from the diagnostic box. I have cleaned the grounds, swapped MAF sensors and installed a new fuel pump, fuel filter and pump relay. What should I look at now wiring, ecm?
All help appreciated thanks
Keep an eye on the fp to ground voltage in the diagnostic connector port while driving. The voltage will go to around 9-10 volts under light load. See if the van is stalling while the voltage is low. If yes, suspect a weak fuel pump or something wrong with the fuel pump resistor or fuel system relay circuit.
There may also be high fuel trims around +20% and a p0171 code.
If low voltage causes a problem, you can jumper the relay itself or jumper the fuel pump resistor connector. Thee fuel pump resistor is located bolted to the body under or nearby the airbox.