I have a1991 Volvo 940gle4 door sedan the harmonic balancer went out and i took the part off but i tried to start it the other just to keep it going (still don't have the new one on just wanted too run it) but it's not starting is that because of the lack of harmonic balancer or is it a fuel problem and where is the bleed our check point to make sure fuel is making it to the injectors. And where are the pumps located and what's the easiest way to get to them

 

How did you try to run without a harmonic balancer? Did you leave off the nut that holds the pulley on? If that is what you did, then most likely your timing belt slipped as the nut holding the harmonic balancer holds the timing belt pulley as well. If it has slipped, you may have damaged your valves as the GLE has the dual overhead cams - which means it is an interference engine.

 

what act said about the harmonic balancer and timing belt!!.


re: your other questions, not sure about any test port, some bricks have a shraeder valve on the end of the fuel rail, but not all of them. the fuel rail is under 42-44 PSI pressure when the pumps are running.

there are two fuel pumps, a booster pump in the gas tank, and the main pressure pump under the back seat (underside of car). the car will run without the booster pump working, as long as there's 1/2 tank or more of gas, but it may suffer fuel starvation at higher demands (higher RPM, with lots of gas pedal), AND it may stumble and stall below a half tank. also, this greatly increases the workload on the main pump, making it more likely to fail.

 

Yes the bolt was out and no my timing hasn't slipped i removed the timing cover and checked I'm thinking it may be the pump relay behind the ashtray but is there a way to check it at home

 

when you turn on the ignition you shoudl hear both pumps run for about 1 second then stop. when you crank the car, they come back on and run about 1 second after you stop cranking.

if you pull out fuse 11 (tank fuel pump), and slip a thin piece of wire around one of the legs of the fuse, then plug that fuse back in, and now connect a test light or volt meter to that piece of wire and a handy ground, that light should light when the pumps are being powered (or the volt meter should read about 12V). if thats working, your relay is good.

your 940 has the 'radio suppression relay' under the hood, this provides power to the fuel injectors. disconnect an injector, turn on the ignition. use said test light or volt meter, with the black wire to the ground rail, touch the red probe to each of the two pins on the plug seperately. one of those two pins should have power (the other one is probably floating). if you don't have power at either pin, check the Radio Suppression Relay, my diagram suggests its near the radiator overflow bottle on the right fender of a 1991 B234F.