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how long will a fuel pump run unplugged is first question I have codes p0463 p0191 p0183 it started out with no codes wouldn't start changed fuel filter it ran fine for 2 days then wouldn't start after sitting i banged on fuel tank it started i shook banged cycled the key for 3 days then got point was taking forever tested relay inertia switch fuel driver changed fuel pump it worked 2 days later in the morning started but then soon as I gave it a little gas it stalled out im stuck here it seems to run even when fuel pump is unplugged dont know if its running off of vacuum or pressure from before unplugging it i also connect ground to battery or rear frame ground and seem to get 7 volts on the tank it self and everywhere else I touch the lead kinda lost at this point dont wanna blow my van up
You do a voltage drop test?? Go from battery negative .post to fuel pump ground wire. Should not see above 0.2 volts. Or go to battery negative to frame of van. I had an Econoline with a bad frame ground once. Next go from battery positive to fuel pump feed should see below .5 volts. Do these tests while cranking. You will need jumper wires since that’s quite a distance the meter leads alone won’t be long enough
There's a over 3v drop at fuel pump and no drop at the driver module I still don't get how if I run a lead to battery negative turn the key on i get 8v on the frame rail or gas tank
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