Question about 1982 Volvo 240 Series

1 Answer

No start - good spark, no fuel

1982 Volvo 240
186,000 miles
Timing belt replaced professionally 135,000
Well maintained until last year when my daughter moved to college

She reported the car had very little power and would not go over 45mph for the last week or so. Monday morning she showed up at our house in the morning stating that the car was running very rough and when she "pushed on the gas it wouldn't go" and had essentially idled all the way (2miles) and shut it off in front of the house.

I finally got around to looking at it this morning.

Would crank well but no start or even signs it wanted to.
Gas gauge read nearly empty, added 5 gals gas. No change to symptoms
removed coil wire from distributor and put near a metal bracked - good spark when cranked
Poured a tablespoon of gas into the power brake booster vacuum line, car fired and tried to run for a couple of seconds.
The electric fuel pump underneath is running and sounds smooth but just a bit noisier than i remember - never shuts off like my other cars after running for a few seconds - don't know if normal or not.
As I was looking at the engine I noticed a loose electrical connector on what appears to be a cylindrical servo sticking out of the intake manifold. Re-clipped but no change to problem.

How do I troubleshoot the fuel system? I have been a mechanic and have a decent set of tools but no shop or lift.

I wouldn't even mind taking it to the shop but would rather not pay for a tow truck.

Any tips or advice would be greatly appriciated!!!!

THANKS,
Harold

Posted by on

  • hgudmund Oct 18, 2008

    John,

    Sorry for not specifying - I do have fuel injection (4 cyl engine) it looks to be the mechanical type with the high pressure pump mounted on the lower leftside of the block. The fuel filter was replaced in April at grease monkey when the oil was changed so i'm assuming it is OK. Is there some easy place I can crack a line (low pressure ) and just see if fuel flows when the key is on?



    With your comment I'm suspecting that the electric pump is not providing flow/volume/pressure because it never shuts off but don't know if there are any bypass valves or solenoids that may be malfunctioning and returning fuel to the tank or if there could be internal leakage in the injection pump.



    Thanks,

    Harold

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  • Volvo Master
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Hi hgudmund,
If you have fuel injection, (the diagnosis will be different than for carbs)....What I would suggest, as a first step, replace the fuel filter....

If there is still no improvement, this is how the pump should operate with fuel injection. the pump should start when the ignition is turned on and after a short burst, cut out, until the engine is cranked up, at which time the pump will run all the time ....

Checking the fuel delivery can be dangerous without the correct equipment for the injection system.....You'll need a fuel pressure test guage....The injection pressure should run at around three and a half bar, minimum....if it's lower than that, you'll need to replace the pump....

There are more tips that I can pass to you, but before I do please let me know how you get on with the first stages....and let me know if we are in fact dealing with injection or carburation?

best regards Johngee10

Posted on Oct 18, 2008

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