Fuel Pump problems

petro68 · August 23rd, 2006, 04:00 PM

I have an 89 GT. I was driving the car and it suddenly just died and would not restart. The fuel pump is not running. I recently purchased the car and the car had not been driven in some time. My gut instinct was that the pump had gone bad. I replaced the pump and had the same issue. Next step, it has to be the fuel pump relay, so I replaced it. Any ideas on where to start next. I am getting a code 95 from the system. Can anyone help short cut the issue for me?

OTreborO · August 23rd, 2006, 05:38 PM

Did you have 12V at the pump, You did replace the fuel filter, correct?

Have you checked the inertia relay? It should be in the trunk on the drivers side, be sure it is good. should have less than 5 ohms resistance across the terminals. Do you have 12V there?

IcantDo55 · August 23rd, 2006, 07:47 PM

Do you own a multimeter? Did you check for power before replacing the Pump? Should have.

petro68 · August 24th, 2006, 02:49 AM

I initially did not check voltage. I was really confident that the pump had just gone out. I did however check for voltage tonight. I have nothing at the pump, I have nothing on either side of the inertia switch. I then went to check for current at the relay. No so good. I looked up the schematic for the wires to test out on the fuel pump relay, put the multimeter to it, and as soon as I touched my ground, I get an arc. Now I know I must have a short somewhere. Any ideas? Anyone? I'm now leaning toward a faulty ignition switch.

1slo5.0 · August 24th, 2006, 03:39 AM

95 (O) Fuel pump: open, bad ground or always on - Power / Fuel Pump Circuits
(R) AIR not Diverting (AIRD) - Air Injection
(M) Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) - Power / Fuel
Pump Circuits

IcantDo55 · August 24th, 2006, 07:12 PM

89's have the relay under the seat still, so should be easy to run some power direct to that thing and call it a day.

August 23rd, 2006, 04:00 PM	#1
petro68 Newbie Join Date: Aug 2006 Posts: 2 iTrader: 0 reviews	Fuel Pump problems I have an 89 GT. I was driving the car and it suddenly just died and would not restart. The fuel pump is not running. I recently purchased the car and the car had not been driven in some time. My gut instinct was that the pump had gone bad. I replaced the pump and had the same issue. Next step, it has to be the fuel pump relay, so I replaced it. Any ideas on where to start next. I am getting a code 95 from the system. Can anyone help short cut the issue for me?

August 23rd, 2006, 05:38 PM	#2
OTreborO Enthusiast Join Date: Apr 2006 Posts: 638 iTrader: 0 reviews	Did you have 12V at the pump Did you have 12V at the pump, You did replace the fuel filter, correct? Have you checked the inertia relay? It should be in the trunk on the drivers side, be sure it is good. should have less than 5 ohms resistance across the terminals. Do you have 12V there? __________________ "Those who forget the past are condemned to repeat it" Rev. Jim Jones

August 23rd, 2006, 07:47 PM	#3
IcantDo55 Enthusiast Join Date: Aug 2005 Location: Va Beach VA Posts: 590 iTrader: 0 reviews	Do you own a multimeter? Did you check for power before replacing the Pump? Should have. __________________ -Mike Link to My Site Want to Play Some Pool??? Stroked and Blown!

August 24th, 2006, 03:39 AM	#5
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	95 (O) Fuel pump: open, bad ground or always on - Power / Fuel Pump Circuits (R) AIR not Diverting (AIRD) - Air Injection (M) Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) - Power / Fuel Pump Circuits __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

August 24th, 2006, 07:12 PM	#6
IcantDo55 Enthusiast Join Date: Aug 2005 Location: Va Beach VA Posts: 590 iTrader: 0 reviews	89's have the relay under the seat still, so should be easy to run some power direct to that thing and call it a day. __________________ -Mike Link to My Site Want to Play Some Pool??? Stroked and Blown!

August 24th, 2006, 02:49 AM	#4
petro68 Newbie Join Date: Aug 2006 Posts: 2 iTrader: 0 reviews	I initially did not check voltage. I was really confident that the pump had just gone out. I did however check for voltage tonight. I have nothing at the pump, I have nothing on either side of the inertia switch. I then went to check for current at the relay. No so good. I looked up the schematic for the wires to test out on the fuel pump relay, put the multimeter to it, and as soon as I touched my ground, I get an arc. Now I know I must have a short somewhere. Any ideas? Anyone? I'm now leaning toward a faulty ignition switch.

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