fuel pump i think
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New User
Joined: Dec 2009
Posts: 9
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From: Maryland
fuel pump i think
have an 89 5.0l. had it in the garage looking at front end getting ready to order suspension parts to rebuild it. backing out it died. would not restart. only code was 33 egr. replaced cap and rotor(needed it any way) getting good spark. either started it it ran 1 min died again. either works to start but dies after either is gone. inertia switch not triped. Can not hear any pump when the key is turned on. To cold today but will be looking at it in a few days. What should i look for?
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
If by any chance the above said doesn't help, and you take down the fuel tank, check the connector for the pump (the one above the tank). with the key in the "ON" position, try pushing and moving the connector, if the pump seems to start/die etc, it's just the connector (wich might or might not need replacing). If nothing else, replace the pump.
Also, check the fuel rail, take the cap and see if it has fuel and is building pressure there. Btw, i was told that models up to 89 had dual pumps, so keep that in mind.
Also, check the fuel rail, take the cap and see if it has fuel and is building pressure there. Btw, i was told that models up to 89 had dual pumps, so keep that in mind.
Cargo Master
Joined: May 2004
Posts: 3,007
Likes: 5
It's also possible to jump the fuel pump shut-off frm the ECM by grounding the test connection. It's the short side of the connection. The connection that's inboard when the test connection is stored. Ground that and the ECM signal to shut off the fuel pump after 3 seconds will not succeed.
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New User
Joined: Dec 2009
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From: Maryland
thanks
Where is the fuel pump relay? I found the fusable link and it was good. After looking under the truck i ordered a high pres pump. Rust rust and more rust. If i have to take the tank down i will most likley replace the whole thing. Rock auto has good prices.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
check fuel pressure at the rail with a gauge. also you can pull a plug to see if its getting fuel. with an 89 i wanna say there are 2 pumps. one intake and another back towards the tank mounted on the frame. might also replace your fuel filter if it hasnt been done in a while.
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Fleet Mechanic
Joined: Feb 2007
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From: Boston, MA
check fuel pressure at the rail with a gauge. also you can pull a plug to see if its getting fuel. with an 89 i wanna say there are 2 pumps. one intake and another back towards the tank mounted on the frame. might also replace your fuel filter if it hasnt been done in a while.
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Fleet Mechanic
Joined: Feb 2007
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From: Boston, MA
like kemical said it looks like you have 2 fuel pumps a low presure in the tank and a high presure inline. I am not sure if I allowed to have a link to rockauto but here it is. the first part is the relay. I would try that first becuase of the easy cheap fix. imho also check to see if you have a large fuse for the pump . keep us posted
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