Where is fuel pump relay?
Thread Starter
Burning Brakes
Joined: Feb 2001
Posts: 769
Likes: 0
From: Granbury TX
Where is fuel pump relay?
The car is a 91 L98. I know it is under the dash somewhere. I can't remember if it is the drivers or passengers side, or specifically which one it is.
A diagram or picture would be very helpful. I am stuck about a thousand miles from my shop, tools and service manuals.
Thanks!
A diagram or picture would be very helpful. I am stuck about a thousand miles from my shop, tools and service manuals.
Thanks!
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
The "91" fuel pump relay is on the passenger side dash under the plastic hush panel where the floor courtesy light is attached to.
After removing the hush panel, (if you're tall you might have to remove the seat) look up towards the rear of the car and you'll see a panel of 5 relays mounted on the dash frame. The fuel pump relay is the middle one if I remember correctly.
It'll be very close to your eye's and I could barely focus on them. Use a flashlight and you'll eventually see it.
After removing the hush panel, (if you're tall you might have to remove the seat) look up towards the rear of the car and you'll see a panel of 5 relays mounted on the dash frame. The fuel pump relay is the middle one if I remember correctly.
It'll be very close to your eye's and I could barely focus on them. Use a flashlight and you'll eventually see it.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
The "91" fuel pump relay is on the passenger side dash under the plastic hush panel where the floor courtesy light is attached to.
After removing the hush panel, (if you're tall you might have to remove the seat) look up towards the rear of the car and you'll see a panel of 5 relays mounted on the dash frame. The fuel pump relay is the middle one if I remember correctly.
It'll be very close to your eye's and I could barely focus on them. Use a flashlight and you'll eventually see it.
After removing the hush panel, (if you're tall you might have to remove the seat) look up towards the rear of the car and you'll see a panel of 5 relays mounted on the dash frame. The fuel pump relay is the middle one if I remember correctly.
It'll be very close to your eye's and I could barely focus on them. Use a flashlight and you'll eventually see it.
if you want to verify if it works, if the fuel pump comes on for 2 secs when key is turned "on" the relay works.
the FP is pretty quiet, so you may have to stand at the gas tank while someone turns key, or you will hear the ABS under the storage tray and think it is pump.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
or use the backup which is more or less automatic, the oil pressure switch. takes more crank time but the engine will run.
Thread Starter
Burning Brakes
Joined: Feb 2001
Posts: 769
Likes: 0
From: Granbury TX
Melting Slicks
Joined: Dec 2009
Posts: 2,749
Likes: 50
From: Westmont Il.
According to the '91 FSM, if the fuel pump relay fails, the fuel pump can be turned on by the oil pressure sensor/switch, also a code 54 will be set. Long cranking times may result because oil pressure needs to be 4psi before the oil pressure sensor/switch turns "on" the fuel pump.
So, yes your car should start with a bad fuel pump relay. You just have to crank it long enough for oil pressure to reach 4psi, then the oil pressure sensor/ switch will turn the pump "on".
(This is also a safety feature to shut the engine if oil pressure drops below that level)
So, yes your car should start with a bad fuel pump relay. You just have to crank it long enough for oil pressure to reach 4psi, then the oil pressure sensor/ switch will turn the pump "on".
(This is also a safety feature to shut the engine if oil pressure drops below that level)
Last edited by Joe B.; Aug 4, 2011 at 10:51 AM.
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Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
A little longer cranking time usually indicates the fuel relay has gone bad.
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
on the 91 it is HIGHLY unlikely that the oil switch plug had been disconnected. so engine should run.
