Assuming it is the same as my 92, it is inside the tank. DISCONNECT THE BATTERY SO THAT YOU DON'T THROW SPARKS!!!! And don't smoke when you're playing with the fuel. Drop the tank by first removing the clamp around the fill spout and then releasing the two support straps. Have the tank supported while you lower it just a little. I hope your tank isn't full like mine was when MY fuel pump went out last summer. Disconnect the wiring and fuel lines, then remove the tank from under the vehicle. Clean debris from around the top of the tank and dig through the sealing tar that is used to protect the tank from water and dirt, then remove the screws and carefully lift the assembly. You will want to save the fuel level sensor, but the entire fuel pump and filter assembly is included in a replacement pump kit. Good luck and be very careful around the fuel. ANOTHER ANSWER: I think the previous responder thought your question was where to find the 'fuel pump', not the 'relay'. There is a removable cover in the engine compartment on the firewall in front of the passenger. You'll find your relay under that cover.
The starter relay can be found underneath the hood on a 1991 Nissan pickup. The starter relay is beside the battery on the passenger side.
under the dash above left kick pad
It is in the fuel tank.
its located at back of enginebay next to bulkhead firewall mounted to a bracket oninnerfender other relay isabs relay fuse holder is forfuel pump
The 1991 Chevrolet S 10 pickup truck oil sending unit is located on the bottom of the engine, in the oil pan. You will need to remove the oil pan in order to access the oil sending unit.
Where is the oil filter located on a 1991 toyota pickup
5 on 5 for 1/2 ton
where is the fuel pump relay for a 1991 Honda accord located
You are probably having the same problem I'm having right now. My relay is located under the hood on the fire wall. If your car is like mine you will see a group of relay (5 I think) the one you is looking for is the second one from the left.
That other relay should be the AC compressor relay.
You will need to tell the kind of car or truck, year of production and engine size. All are located in different places. 1991 Isuzu pickup with 3.1
Near the radiator, passenger side. Two black plastic pins mount it to the radiator mounting bracket.
The AC power relay is located behind the right side of the dash on a 1991 Chevy Corvette. It is on top of the plenum.
The 1991 Volvo brake light relay switch is located beneath the drivers side dashboard. The brake light relay switch will be above the brake pedal.
It is inside the alternator.
The relay is located behind passenger side kick panel.
The 1991 Dodge diesel truck glow plug relay is located in the fuse box. The fuse box is located behind the battery box. The glow plug relay will be in the right upper corner of the box.
Get a manual on your car to do the job right.
mounted on the trans
mine is located on the drivers side of the dash
The transmission dipstick for the 1991 Chevrolet Caprice is located on the side of the transmission. It will be behind a valve cover.
In the tank
Your 1991 Mercury fuel pump relay switch is located on the firewall of the engine compartment. The relay switch will be near the center of the firewall.
The ecm module is located behind the passenger side kick panel. I don't know of an ecm relay.