Help with fuel system. Pump not running

tsidewayz · 12-09-2005, 11:06 AM

Ok, here's the deal. I have a mildly mofdified 91 GT. It has been sitting for the last 7 years waiting for my son to turn 16. Well it almost time. For the first 6 years or so I would start it every couple of weeks. Then a bout a year ago I moved the car from one parking spot to another then let it sit for about 1 month. Tried to start it and nothing. The fuel pump wouldnt fire. I pulled out the pump and direct wired it to a battery. It turned on, no problem. I couldn't find anything wrong. I was able to get the pump to turn on, while in the tank, by grounding the light blue wire coming from the relay under the driver seat.

My question is what is that wire for and does that give any indication of what might be wrong. I have even replaced that relay under the seat.

Any help would be appreciated.

tsidewayz

Joel5.0 · 12-09-2005, 01:05 PM

Sounds like the FP relay is not being activated by the ECM,...do you see the check engine light indicator turning on? Your problem could be caused by a bad EEC relay, which is located above the ECM behind the right kick panel. Since the car has been in storage for a long period of time, it is also possible that the problem is simply a bad ECM ground cable or connection. Check the small ground cable by the (-) terminal of the battery and make sure it's clean and making a good connection. Hope this helps.

12-09-2005, 11:06 AM	#1
tsidewayz Registered Member Join Date: Jun 2000 Location: Modesto, Ca. USA Posts: 1	Help with fuel system. Pump not running Ok, here's the deal. I have a mildly mofdified 91 GT. It has been sitting for the last 7 years waiting for my son to turn 16. Well it almost time. For the first 6 years or so I would start it every couple of weeks. Then a bout a year ago I moved the car from one parking spot to another then let it sit for about 1 month. Tried to start it and nothing. The fuel pump wouldnt fire. I pulled out the pump and direct wired it to a battery. It turned on, no problem. I couldn't find anything wrong. I was able to get the pump to turn on, while in the tank, by grounding the light blue wire coming from the relay under the driver seat. My question is what is that wire for and does that give any indication of what might be wrong. I have even replaced that relay under the seat. Any help would be appreciated. tsidewayz __________________ "You Know That Feeling You Get When You Lean Back In Your Chair And Almost Fall?... I Feel Like That All Day!!!!"

12-09-2005, 01:05 PM	#2
Joel5.0 Registered Member Join Date: Oct 2005 Location: Sabana Grande, Puerto Rico Posts: 33	Re: Help with fuel system. Pump not running Sounds like the FP relay is not being activated by the ECM,...do you see the check engine light indicator turning on? Your problem could be caused by a bad EEC relay, which is located above the ECM behind the right kick panel. Since the car has been in storage for a long period of time, it is also possible that the problem is simply a bad ECM ground cable or connection. Check the small ground cable by the (-) terminal of the battery and make sure it's clean and making a good connection. Hope this helps. __________________ ACRONYMS: LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That and the classic... DILLIGAS=Do I Look Like I Give A S*** 1986 Mustang GT w/T-Tops NOW: 5.0L Stock SB, X303 Cam, 700 cfm DP Holley, 289 '66 Heads, 1.7 RR, Richmond Gear 4+1 Tranny, Centerforce DF, 2.73 Gears WIP: 3.90 Gears, LS Overhaul, Adj. LCA's & UCA's (Granatelli), T-Top weather striping and rear braces bodywork

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