fuelpump
Team Owner
Joined: Jul 2004
Posts: 28,366
Likes: 3,257
From: Hartford WI
Why are you expecting it at the fuel pump? It gets 2 seconds of charge and that is it. After that, it needs the ECM to detect ignition pulses. How did you determine there is no power at the pump but power at the relay? Shouldn't there be power to the relay and when the signal is given from the ECM, the pump "turned on"?
Race Director
Joined: Oct 2011
Posts: 16,079
Likes: 816
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
What kind of pump did you put in the car? Might be wired backwards. Aka, negative and positive switched. That would make the pump blow and not suck.
Team Owner
Joined: Jul 2004
Posts: 28,366
Likes: 3,257
From: Hartford WI
I guess we need to know the process he used to determine no juice. As my math instructors used to say "No working, no credit". If he probed the wires when he turned the key to run, it might show a momentary blip and then nothing but what do you expect? The pump is only hot when the motor is running FOR A REASON.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
The ECM applies a ground signal to relay to energize fuel pump to " prime" fuel system
there is oil pressure switch that will apply 12v to fuel pump once oil pressure is over 5 psi.
there is oil pressure switch that will apply 12v to fuel pump once oil pressure is over 5 psi.
Team Owner
Joined: Jul 2004
Posts: 28,366
Likes: 3,257
From: Hartford WI
Thread Starter
Cruising
Joined: May 2016
Posts: 11
Likes: 0
Fuel pump
thx for the reply I wrongly assumed the fuel
pump received current all the time. This started as a intermittent problem and finally will not run at all. I am going to replace the fuel pump and see what happens. With the key on there is no current at the fuse according to my test light. Any advice is greatly appreciated
pump received current all the time. This started as a intermittent problem and finally will not run at all. I am going to replace the fuel pump and see what happens. With the key on there is no current at the fuse according to my test light. Any advice is greatly appreciated
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Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
1. Get a copy of the FSM (Factory Service/Shop Manual) for your car.
2. Don't throw money at a problem when you don't know what the problem is! If there's no power at the fuse, the fuel pump CAN'T run!
Team Owner
Joined: Jul 2004
Posts: 28,366
Likes: 3,257
From: Hartford WI
thx for the reply I wrongly assumed the fuel
pump received current all the time. This started as a intermittent problem and finally will not run at all. I am going to replace the fuel pump and see what happens. With the key on there is no current at the fuse according to my test light. Any advice is greatly appreciated
pump received current all the time. This started as a intermittent problem and finally will not run at all. I am going to replace the fuel pump and see what happens. With the key on there is no current at the fuse according to my test light. Any advice is greatly appreciated
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
thanks, that's the term....didn't replace it the first time I went in there....found the fuel line blowing out every time I energized the fuel pump.....replaced it with a longer hose, have had no problems with that part of it since....getting old's hell 
Team Owner
Joined: Jul 2004
Posts: 28,366
Likes: 3,257
From: Hartford WI
Where did you get the fuel line to replace it with? All can transmit fuel inside but some can be submerged and others cannot.
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
Thread Starter
Cruising
Joined: May 2016
Posts: 11
Likes: 0
apply 12v to terminal G on your aldl....just went through all of this on my 85......if no results, get a separate battery, apply 12 v and ground to the grey and black (ground) on the pigtail going into the bulkhead on the tank....if no fuel pressure, start looking down that line to the fuel pump.....I found bad ground, and poor connections at the bulkhead.....also, if you didn't bypass that little connector above the fuel pump line....name escapes me at the moment, the fuel line could be blowing out when the pump pressurizes, and blows gas back into the tank.....good luck.... I 'm assuming you have a pressure gauge on you schlader valve
when you say bulkhead do you mean firewall in engine compartment? anything lose under the dash?
Burning Brakes
Joined: Dec 1999
Posts: 982
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From: Columbia MD