Continously running fuel pump

Barlow · 10-28-2009, 06:57 AM

From the sound and constant draining of my battery, I've deduced that, for some reason, the fuel pump is not shutting off, even with the ignition off. I'm assuming that something tells the pump to run for a few seconds to prime the system when the ignition is first keyed on. Anyone have any thoughts as to what would cause this?

SH-60B · 10-28-2009, 07:38 PM

The fuel pump relay.

BarelyGettinBy · 10-28-2009, 07:47 PM

Mine done the same thing replaced the fuel pump relay and it still ran all the time. Turned out to be a wire from my oil pressure sending unit had laid on the manifold and shorted out. From what I understand the current for the fuel pump is supplied through the opsu

lesterl · 10-28-2009, 11:00 PM

The fuel pump relay is a priming device for the fuel system and will also engage after the engine starts, the Oil Pressure switch can go bad and keep the pump running (my 88 van would run for a min after shutting off untill I ran some cleaner thru the system.)

grillen85 · 10-29-2009, 01:05 AM

Quote: Originally Posted by lesterl

The fuel pump relay is a priming device for the fuel system and will also engage after the engine starts, the Oil Pressure switch can go bad and keep the pump running (my 88 van would run for a min after shutting off untill I ran some cleaner thru the system.)

Hrmmm.. So if my oil pressure switch is bad my fuel pump will an can stay on for a few seconds ( seconds for my case ne way) after the truck is already off.Thats good to know cause my trucks pump def. stays on for a few seconds after I turn it off an I know for sure that the oil sender doesnt work right.

lesterl · 10-29-2009, 09:39 PM

Quote: Originally Posted by grillen85

Hrmmm.. So if my oil pressure switch is bad my fuel pump will an can stay on for a few seconds ( seconds for my case ne way) after the truck is already off.Thats good to know cause my trucks pump def. stays on for a few seconds after I turn it off an I know for sure that the oil sender doesnt work right.

Yup, I could turn off, get out, and be 1/2 way to the house before it quit, I ran some seafoam through the crankcase and it has ceased doing so. I reccomend the seafoam at your own risk tho....

BarelyGettinBy · 10-29-2009, 10:01 PM

Yep I would def check that mine would do the same thing except it would run up to a full minute after shutting the truck off

10-28-2009, 06:57 AM	#1
Barlow Registered User Join Date: Sep 2009 Posts: 2 Location: User is: OffLine	Continously running fuel pump From the sound and constant draining of my battery, I've deduced that, for some reason, the fuel pump is not shutting off, even with the ignition off. I'm assuming that something tells the pump to run for a few seconds to prime the system when the ignition is first keyed on. Anyone have any thoughts as to what would cause this?
	[Reply w/Quote]

10-28-2009, 07:38 PM	#2
SH-60B Registered Neanderthal Join Date: Nov 2007 Posts: 2,335 Location: Meriden/CT/USA User is: OffLine	Re: Continously running fuel pump The fuel pump relay.
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10-28-2009, 07:47 PM	#3
BarelyGettinBy Registered User Age: 20 Join Date: Apr 2008 Posts: 1,359 Location: London Ky User is: OffLine	Re: Continously running fuel pump Mine done the same thing replaced the fuel pump relay and it still ran all the time. Turned out to be a wire from my oil pressure sending unit had laid on the manifold and shorted out. From what I understand the current for the fuel pump is supplied through the opsu
	[Reply w/Quote]

10-28-2009, 11:00 PM	#4
lesterl Wire Splicin Fool :-) Age: 30 Join Date: May 2008 Posts: 4,413 Location: Harrisonville, MO User is: OffLine	Re: Continously running fuel pump The fuel pump relay is a priming device for the fuel system and will also engage after the engine starts, the Oil Pressure switch can go bad and keep the pump running (my 88 van would run for a min after shutting off untill I ran some cleaner thru the system.)
	[Reply w/Quote]

10-29-2009, 01:05 AM	#5
grillen85 Registered User Age: 27 Join Date: May 2005 Posts: 548 Location: User is: OffLine	Re: Continously running fuel pump Quote: Originally Posted by lesterl The fuel pump relay is a priming device for the fuel system and will also engage after the engine starts, the Oil Pressure switch can go bad and keep the pump running (my 88 van would run for a min after shutting off untill I ran some cleaner thru the system.) Hrmmm.. So if my oil pressure switch is bad my fuel pump will an can stay on for a few seconds ( seconds for my case ne way) after the truck is already off.Thats good to know cause my trucks pump def. stays on for a few seconds after I turn it off an I know for sure that the oil sender doesnt work right.
	[Reply w/Quote]

10-29-2009, 09:39 PM	#6
lesterl Wire Splicin Fool :-) Age: 30 Join Date: May 2008 Posts: 4,413 Location: Harrisonville, MO User is: OffLine	Re: Continously running fuel pump Quote: Originally Posted by grillen85 Hrmmm.. So if my oil pressure switch is bad my fuel pump will an can stay on for a few seconds ( seconds for my case ne way) after the truck is already off.Thats good to know cause my trucks pump def. stays on for a few seconds after I turn it off an I know for sure that the oil sender doesnt work right. Yup, I could turn off, get out, and be 1/2 way to the house before it quit, I ran some seafoam through the crankcase and it has ceased doing so. I reccomend the seafoam at your own risk tho....
	[Reply w/Quote]

10-29-2009, 10:01 PM	#7
BarelyGettinBy Registered User Age: 20 Join Date: Apr 2008 Posts: 1,359 Location: London Ky User is: OffLine	Re: Continously running fuel pump Yep I would def check that mine would do the same thing except it would run up to a full minute after shutting the truck off
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