2 Fuel Pumps Bad?
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2 Fuel Pumps Bad?
I have a 1989 F159 with dual tanks. Neither fuel pump comes on when I turn on the key. The high pressure pump works fine. If I start the truck it will run great for a while then sputter and die. If it sits for 10 minutes it starts again for a while. I am thinking that both fuel pumps are bad but I thought I'd check here for ideas before I buy two.
Also, the fuel gauge shows way over full on both tanks.
Also, the fuel gauge shows way over full on both tanks.
Last edited by ChurchBuilder; Oct 20, 2006 at 06:18 AM. Reason: forgot something
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Ground pin #6 on the test connector with the key on and see if they run.
Also see if the truck runs with Pin#6 grounded.
The test connector:
http://i54.photobucket.com/albums/g9...taLinkConn.jpg
Also see if the truck runs with Pin#6 grounded.
The test connector:
http://i54.photobucket.com/albums/g9...taLinkConn.jpg
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by ChurchBuilder
The high pressure pump comes on when I ground pin #6 but the others don't. It didn't start with pin #6 was grounded.
Here is a diagram of your system:
http://i54.photobucket.com/albums/g9...-89FSeries.gif
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I hate to jack the thread but no one wants to answer my question. I get no power to either pump and the switch will change the gauge over but the pumps dont get power. Could the switch cause this?
Also tried that grounding trick and it did nothing.
Also tried that grounding trick and it did nothing.
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Senior User
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From: Ottawa
Youre a very lucky man. If I wasn't too lazy to install my new sending unit in the rain I wouldn't have been able to have taken this amazing photo.
The red and black wires are power to the people. No that's not right! I mean power to the pump. apply power directly and listen for pump sounds.
If it works it's probably the selector switch or wiring harness. I took mine apart last week and cleaned all the contacts the painted them with Di-electric grease, also cleaned all the grounding straps I could find and hit them with the di electric grease as well. Likely got nothing to do with your problem but won't hurt.
The red and black wires are power to the people. No that's not right! I mean power to the pump. apply power directly and listen for pump sounds.
If it works it's probably the selector switch or wiring harness. I took mine apart last week and cleaned all the contacts the painted them with Di-electric grease, also cleaned all the grounding straps I could find and hit them with the di electric grease as well. Likely got nothing to do with your problem but won't hurt.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
Front Tank = FP Ground = Black or Orange
Front Tank = FP Power = Red
Front Tank = Gauge = Dark Blue with Yellow Stripe
Front Tank = Sen Ground = Black
Rear Tank = FP Ground = Black or Orange
Rear Tank = FP Power = Brown with White Stripe
Rear Tank = Gauge = Yellow with Lt Blue Stripe
Rear Tank = Sen Ground = Black
Note that "Sen Ground" goes to the pump body and has no wires inside tank and the sender is screwed to the pump body for ground.
The "FP Ground" does not have continuity to the pump body or tank.
Above Photo with info added.
Front Tank = FP Power = Red
Front Tank = Gauge = Dark Blue with Yellow Stripe
Front Tank = Sen Ground = Black
Rear Tank = FP Ground = Black or Orange
Rear Tank = FP Power = Brown with White Stripe
Rear Tank = Gauge = Yellow with Lt Blue Stripe
Rear Tank = Sen Ground = Black
Note that "Sen Ground" goes to the pump body and has no wires inside tank and the sender is screwed to the pump body for ground.
The "FP Ground" does not have continuity to the pump body or tank.
Above Photo with info added.
Last edited by subford; Oct 21, 2006 at 07:46 AM.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by iceman7329
I hate to jack the thread but no one wants to answer my question. I get no power to either pump and the switch will change the gauge over but the pumps dont get power. Could the switch cause this?
Also tried that grounding trick and it did nothing.
Also tried that grounding trick and it did nothing.
But it would be easier to read your post and answer you questions without that photo.
I do not know what year or type of truck you are asking about but you might check the Inertia fuel shutoff switch.
If you have a truck and not a van then you would not have the pump on the frame if yours is a 1990 or newer.