Fuel pump not working
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Joined: Oct 2013
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Fuel pump not working
Fuel pump for my 87 Z52 seems to be not working, pulled the in line filter (new) and only getting a slow drip at all times, is there anything i should check or is the fuel pump just bad?
Drifting
Joined: Jun 2013
Posts: 1,590
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From: ft myers FL/Munising MI
put a pressure guage on the fitting on the fuel rail. turn the key on...pressure should go right up....or listen at the tank...it should run for 2 sec....better to test the pressure..so you know you have enough
Team Owner
Joined: Dec 1999
Posts: 34,873
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The FP only runs for a couple seconds when you turn the key to the ON position. You should be able to hear a faint clicking at the rear of the car when the ignition switched is turned on.
Did you check fuel pressure with filter hooked up?
Will the engine start?
Did you check fuel pressure with filter hooked up?
Will the engine start?
Safety Car
Joined: Jan 2004
Posts: 3,556
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Put 12V to terminal G of the ALDL under the dash ,the pump should run full time so you can do the pressure tests mentioned above.
If you confirm the pump is running and have little /no pressure at the rail,then you may have a leaking hose in the tank that
connects the pump to the line out
]
Thread Starter
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Joined: Oct 2013
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i depressed the fitting while i had someone cranking it and no pressure
Thread Starter
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Can you hear the pump run?
Put 12V to terminal G of the ALDL under the dash ,the pump should run full time so you can do the pressure tests mentioned above.
If you confirm the pump is running and have little /no pressure at the rail,then you may have a leaking hose in the tank that
connects the pump to the line out
]
Put 12V to terminal G of the ALDL under the dash ,the pump should run full time so you can do the pressure tests mentioned above.
If you confirm the pump is running and have little /no pressure at the rail,then you may have a leaking hose in the tank that
connects the pump to the line out
]
Thread Starter
Advanced
Joined: Oct 2013
Posts: 98
Likes: 0
Can you hear the pump run?
Put 12V to terminal G of the ALDL under the dash ,the pump should run full time so you can do the pressure tests mentioned above.
If you confirm the pump is running and have little /no pressure at the rail,then you may have a leaking hose in the tank that
connects the pump to the line out
]
Put 12V to terminal G of the ALDL under the dash ,the pump should run full time so you can do the pressure tests mentioned above.
If you confirm the pump is running and have little /no pressure at the rail,then you may have a leaking hose in the tank that
connects the pump to the line out
]
Thread Starter
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Joined: Oct 2013
Posts: 98
Likes: 0
How hard would it be to replace the fuel pump and how is it done?
i have a spare fuel pump unit from a northstar cadillac eldorado thats around 45PSI, but do the C4s require a specific fuel pump or can they be used interchangeably
i have a spare fuel pump unit from a northstar cadillac eldorado thats around 45PSI, but do the C4s require a specific fuel pump or can they be used interchangeably
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Safety Car
Joined: Jan 2004
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Thread Starter
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Joined: Oct 2013
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actually went ahead and did it
the N* cadillac fuel pump fit in without too much trouble or modifications
had to change the pigtail due to a different design, and it was a little taller and slimmer, but it worked and i got the car started up
going to need a new gasket though since the original fell to pieces, probably going to use RTV sealant
the N* cadillac fuel pump fit in without too much trouble or modifications
had to change the pigtail due to a different design, and it was a little taller and slimmer, but it worked and i got the car started up
going to need a new gasket though since the original fell to pieces, probably going to use RTV sealant
Thread Starter
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actually upon further research the northstar fuel pump produces 70PSI and 40-45 at the rail which makes it a good replacement for the stock L98 fuel pump
this might be useful to other people with the same problem
this might be useful to other people with the same problem
Thread Starter
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Joined: Oct 2013
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Unfortunately i seem to be having problems again
I can test the pump (12V to pin G) and hear the pump run and relay click and get fuel pressure, but otherwise i am getting no power to the pump otherwise even though the fuse is good
I can test the pump (12V to pin G) and hear the pump run and relay click and get fuel pressure, but otherwise i am getting no power to the pump otherwise even though the fuse is good
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
If you crank the engine for approx. 5 sec. the fuel pump should run through contacts of the oil pressure sw..
This is for my 84 but s/b the same for yours..
This is for my 84 but s/b the same for yours..
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
What relay are you hearing click when you put 12v on pin G??