Fuel pump relay location needed

Tiny
ALWAYSWEET45
  • MEMBER
  • 2004 MITSUBISHI LANCER
  • 4 CYL
  • 145,000 MILES
Where is the fuel pump relays location? How many fuel pump relays are they for this car one or two?
Do you
have the same problem?
Yes
No
Saturday, April 21st, 2018 AT 4:24 PM

6 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good evening. The relay is in the under dash fuse panel, drivers side. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Was this
answer
helpful?
Yes
No
+5
Saturday, April 21st, 2018 AT 4:39 PM
Tiny
ALWAYSWEET45
  • MEMBER
Thank you Roy.
Was this
answer
helpful?
Yes
No
+2
Saturday, April 21st, 2018 AT 4:57 PM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome. Glad to help.
Was this
answer
helpful?
Yes
No
+2
Saturday, April 21st, 2018 AT 4:58 PM
Tiny
ANTONIAJADE99
  • MEMBER
  • 2002 MITSUBISHI LANCER
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 320,000 MILES
I have purchased a new fuel pump and it is still got no power to it. My partner looked under the bonnet and under the steering wheel and cannot find a relay. I have no idea what to do, any suggestions would be appreciated.
Was this
answer
helpful?
Yes
No
+2
Wednesday, March 31st, 2021 AT 12:27 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

The relay/fuse box is under the dash on the left side of the vehicle. There are two fuel pump relays. I attached a few pictures to help you locate them.

Under the hood, check fuse 8 in the fuse box. See last picture.

Let me know if this helps.

Joe
Was this
answer
helpful?
Yes
No
Wednesday, March 31st, 2021 AT 12:27 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
The most common mistake is expecting to find 12 volts at the fuel pump when just turning on the ignition switch. The first thing to do is try to listen for the hum of the pump for just one second when you turn on the ignition switch. Sometimes that is hard to do with the chime making noise.

The next thing is to check for spark while a helper cranks the engine. Defective fuel pump circuits cause the crank/no-start problem only about five percent of the time. A loss of fuel pump and spark causes closer to 95 percent of these failures, but most people get stuck on the first thing they find missing and forget to look for other things that are dead.

If you have no spark, this conversation will need to go in a different direction. If you never hear the hum of the fuel pump, either during cranking or for that first one second after turning on the ignition switch, look first for fuse number 10, a 15-amp, in the under-hood fuse box, then fuse number 8, a 7.5-amp fuse in the inside fuse box on the left end of the dash. That inside fuse box is also where you'll find two fuel pump relays. Both must turn on for the pump to run. Relay number 1 turns on when the ignition switch is turned on. Relay number 2 is turned on by the Engine Computer for that first one second, then again during engine rotation, (cranking or running).

If you get 12 volts to the fuel pump for one second, but not again during cranking, the common suspects become the crankshaft position sensor and the camshaft position sensor. It is their signals that tell the Engine Computer when the engine is rotating and it is time to turn on that second fuel pump relay. With the signal missing from one of those sensors, you will not have spark either because the computer does not know when to fire the ignition coils.

Before you randomly replace a sensor, read and record any diagnostic fault codes. Normally when a part is referenced in a fault code, it is actually the cause of that code only about half of the time. First we have to rule out wiring and connector terminal problems. In the case of these sensors, they do have a fairly high failure rate, but be aware it can be difficult for a fault code related to them to set, so just because there is no fault code, that does not prove the sensors are good.

Please describe the symptom you are trying to solve if we need to go further, and any related history leading up to the problem.
Was this
answer
helpful?
Yes
No
+4
Wednesday, March 31st, 2021 AT 12:27 PM (Merged)

Please login or register to post a reply.

Sponsored links