I have a 1984 Volvo DL wagon that won't start. The problem seems to be the wire supplying power to the in tank fuel pump. The relay works and the pump makes the usual noise when power is jumpered to it. But the blue wire going to the "common" on the relay switch has no power. Does the in tank pump stay on constantly, or does it switch on and off as needed. I'm temted to jumper power from the relay coil 12V to the relay switch to power the pump. Please help. Thank you for your time!
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I seem to remember that there was a relay for the fuel pump. Remover the wires from the fuel pump. Install a lower rating fuse and see if it. Lows. If it does the. There is a problem with the fuel pump relay or you have a short circuit in your wiring. The. You will. Red a diagram to chase that down. Note rays tend to go open circuit on the co instead of shorting out. If the fuse that is. Lowing is on the power side of the relay whe. The pump is disconnected the. You have a wiring short. If it does not blow with the pump disconnected, it is your pump getting ready to go to the big tank in the sky. Good luck
You need to check your engine wiring harness. 84 is part of the crumbling, corroding wiring insulation years. If your harness has not been replaced, you may have to really scrounge around to find one of the "new" versions that has okay insulation on the wiring.
NO Diesel engines dont have spark plugs so dont worry about it as the ones you have should be ok BUT first check the length of the plug thread to the ones you took out, are they the same as they have to be the correct length and not any diffreance also the earth tip on the end
If they look the same 100% your ok to go. RON
Replace engine oil and filter, air filter and fuel filter.
Drain the fuel tank and add fresh fuel.
Remove the spark plugs and put a squirt of oil in each cylinder. Remove coil lead and crank engine until oil pressure comes up.(light goes out),
replace coil lead and start engine.. it will blow smoke for first few minutes. Check trans fluid, brake fluid etc before driving. Theres a good chance the brakes will need an overhaul.
I have a 1984 Gl Wagon 4WD; the fuel pump is located on the passenger side, on the frame rail under the back door, just in front of the rear wheel. It and the fuel filter are accessed by dropping the mounting plate that also serves as a protective plate. Again, this is the 4WD non-turbo EA81 engine GL Wagon; could be different on the 2WD version.
Check for vacuum leaks,pull off your intake hose and look for small cracks,also go to the rear of car and listen for you intank fuel pump,needs to making an humming sound,no sound or intermediate this can be your problem.
In my 86 volvo this is where a relay was under the glove box area i believe it was the fuel pump relay. In my vehicle i washed the car and found it did not start afterwards after many hours of troubleshooting i found this relay was full of water causing my problem, they hang it upside down so water can enter easily, i took mine apart and cleaned the contacts with sandpaper, worked fine afterwards.