Volvo 850 random stalling and hard to start. Testing Fuel Pump and Fuel Pump Relay – Volvo Forums…

22 Jan 2015 | Author: | Comments Off on Volvo 850 random stalling and hard to start. Testing Fuel Pump and Fuel Pump Relay – Volvo Forums…

Volvo 850

random stalling and to start. Testing Fuel and Fuel Pump Relay


I notice that in the Volvo 850 section of these a decent percentage of the number of being posted involve trying to diagnose and fix a Volvo either turns over but start and run or has a start-sputter-… situation due to starvation. Among many one likely cause of these is the fuel pump relay. people seem to want to how to test if their fuel is running, and if it is not, how to test if the is working correctly, so I have put this write up/How-to for the of how to test your fuel and fuel pump relay.

Perform the tests listed WHILE your car is acting up. of these issues are intermittent, so it really help to do the test the car is wanting to start!

Steps for listening for fuel :

1. Walk over to your gas on the right side/rear of car.

2. Lie near this section of the

3. With the car parked in a quiet have another person the key in the ignition to the ON position but do NOT start the

4. Once the key is in the ON position, you should be to hear a humming that for a few seconds and stops.

If you don’t hear anything, fuel pump is not running. there, diagnose whether its the or the relay (or possibly both) are bad. NOTE: Even if you the pump run initially but when you try to the car it sputters and dies, you still to check your fuel relay.

Steps to test if the pump relay is bad :

1. Open hood and remove screws holding down the over the fuse box that is in the top right of the engine bay.

2. the red relay labeled 103 (see attached below).

3. Bend a clip or wire to connect ports 15 and 87 in the fuse box where the previously was.

4. Either try to the car OR do the steps above for listening for the pump, then start car you have determined that the pump is running. NOTE: if you do to listen to the pump before you the car, it may run continuously rather shut off after a few seconds.

If your fuel pump and your car starts and stays while the paper clip/wire is in the relay socket, your is bad. This is the part you

If this test does not run fuel pump and your car not start, you either have a bad a wiring issue, or some problem that needs to be into.

This test is not recommended to be a fix, but rather just as a for the fuel pump relay.

this helps all of you having issues involving fuel

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