should fuel pump run with key in on position


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should fuel pump run with key in on position

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ptsully
New User

Mar 23, 2008, 12:05 PM

Post #1 of 4 (2078 views)

should fuel pump run with key in on position	Sign In

1996 full size dodge van, 318 fuel injected
it wont start, good spark. I thought the pump ran with key on?
Mine pumps when cranking, I dropped the tank and removed fuel line.
I think its a wiring problem, last week if i hit a pot hole it cut out for a second.

help please

DanD
Veteran / Moderator
DanD profile image

Mar 23, 2008, 12:51 PM

Post #2 of 4 (2072 views)

Re: should fuel pump run with key in on position	Sign In

No the pump is not suppose to run with the ignition in the run position alone (engine not running).
When the ignition is turned on without cranking the engine; the fuel pump will run for approximately two seconds and then shuts off, that’s to prime the fuel system with pressure. After the “prime cycle” the pump will not run again, until the engine is cranked and the computer sees an rpm signal from the ignition system.
There’s a little more to this explanation but that’s more or less what’s supposed to happen.

Dan.

Canadian "EH"

ptsully
New User

Mar 23, 2008, 1:08 PM

Post #3 of 4 (2070 views)

Re: should fuel pump run with key in on position	Sign In

Thanks DanD, simple question but couldn't get an answer from anybody else.
gona try a couple of things in the morning.
thanks again.

mitseclipse
Anonymous Poster
explorerboi28@yahoo.com

Mar 24, 2008, 10:33 AM

Post #4 of 4 (2061 views)

Re: should fuel pump run with key in on position	Sign In

Yes for a few seconds to pressurise the system then it will shut off.if it keeps going it not getting the fuel it needs to get to so many p.s.i for it to shut off

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