Fuel Relay or Fuel Pump?

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07-04-2006, 02:55 PM

MustangEd

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Join Date: Jul 2006

Posts: 7

Fuel Relay or Fuel Pump?

I have a 88 Convertable LX. My problem is what I thought to be the fuel relay. I have to unhook the battery everytime I turn off the engine, otherwise if i dont you hear humming in the back and what seems to be fuel being pumped to the engine and the smell of gas when the car is turned off. Today I went and disconnected the relay in the trunk and reconnected the battery and wow its still humming, what seems to be fuel pumping to the engine, and the smell of gas. So my thought is maybe the fuel pump, but my other thought is that there might be another relay in the front under the hood that I just can not see.

07-04-2006, 03:13 PM

randy78045

6th Gear Member

Join Date: Jan 2006

Location: Laredo, TEXAS

Posts: 6,054

RE: Fuel Relay or Fuel Pump?

doesnt sound like the pump... id look hard at the relay...

07-04-2006, 03:29 PM

MustangEd

Thread Starter

Join Date: Jul 2006

Posts: 7

RE: Fuel Relay or Fuel Pump?

The relay in the trunk was unplugged fully and when I rehooked the battery, so is there another relay somewhere that I dont know about? And if so where is the other one?

07-04-2006, 03:31 PM

randy78045

6th Gear Member

Join Date: Jan 2006

Location: Laredo, TEXAS

Posts: 6,054

RE: Fuel Relay or Fuel Pump?

i believe there is one under the drivers seat... [:-]

07-04-2006, 03:32 PM

sdmaker

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Posts: 563

RE: Fuel Relay or Fuel Pump?

look under your driverside front seat.

07-04-2006, 03:49 PM

Joel5.0

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Join Date: Jan 2006

Location: Puerto Rico

Posts: 3,926

RE: Fuel Relay or Fuel Pump?

Quote:

ORIGINAL: MustangEd

I have a 88 Convertable LX. My problem is what I thought to be the fuel relay. I have to unhook the battery everytime I turn off the engine, otherwise if i dont you hear humming in the back and what seems to be fuel being pumped to the engine and the smell of gas when the car is turned off. Today I went and disconnected the relay in the trunk and reconnected the battery and wow its still humming, what seems to be fuel pumping to the engine, and the smell of gas. So my thought is maybe the fuel pump, but my other thought is that there might be another relay in the front under the hood that I just can not see.

It's not the pump....the pump is on due to the presence of 12-vdc, it shouldn't be be there. You could have a wiring problem, or a modification made to the OEM wiring that is causing the voltage ign-off condition at the pump. Use this wiring diagram and trace the wire that feeds the voltage to the pump....