Question about 1985 Volvo 740

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1985 volvo 740 gle no turbo-main fuel pump humming

On a recent trip from california to florida, the main fuel pump on the car started to whine loudly; i was told by a volvo shop that at around 180,000 miles or so the pumps start to go bad; the prepump in the tank was already out so i assumed it was that, that as causing the main pump to work harder and whine; i just replaced the prepump yesterday and the check valve on the main pump-[was hard starting and dumping fuel on startup] and now it runs well, no hard starting but the main pump is humming a little. Do i need to replace the main pump?

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If it works leave well alone till it starts getting noisy,its a 1985 ,over 20yrs old so it wont last much longer till it fails the annual vehicle technical inspection,then when you need a part for the suspension or steering its obsolete.

Posted on Feb 13, 2009


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Change the fuel filter, and ensure the pump(s) are working. Some cars only have one pump in the tank. Others have two, and they are both driven from a relay in the engine compartment. Depending on model and year, this relay may be near the anti-boil overflow bottle, or on the driver's side, near the battery. If you turn the key to ON you should hear a gentle whir for two seconds. If that sound isn't present, the pump or relay is suspect. If it is loud, the pump is failing.
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Check your start injector (under the intake manifold). If OK, check the air valve. 12 VDC at the connector should mean the valve will move when tapped or shaken lightly. To see if it moves - shine a flashlight through the upper opening...
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