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Starts and then just dies

(1990 Volvo 240)
in Garden Grove, CA on February 05, 2018
The car starts just fine, as soon as you release the key it dies. I checked at the coil, and it has power in the "key on" position. All the cylinders are getting good spark continuously. I cracked open the fuel feed line at the injector rail, and the car has fuel pressure with the 'key-on' position however no residual pressure or fuel at all when the key is off.
Tags: volvo, 240
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on February 05, 2018


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on February 05, 2018
Fuses are all good, "light" type tester shows continuity through the fuses. Fuel pump runs and builds some pressure with the key on. This pressure and any residual fuel is gone as soon as you turn off the key. The rail when key is off has zero residual pressure or even fuel visible (I'm not sure if this system retains fuel pressure in the system after stopping the engine or not, if so, I would think the fuel regulator is not allowing the system to build enough pressure and retain it?)
on February 05, 2018
If you just leave the key on, the pump just runs non-stop. It never seems to build up the pressure needed before the pressure regulator bypasses.
on February 05, 2018
either that, or the regulator is continuously bypassing?
on February 05, 2018

OK - Two questions:

IF inadequate fuel pressure is suspected - WHAT is the difference in fuel pressure when the engine is CRANKING or just with the key ON?

In other words - WHY does the engine run until key is released?

The fuel *pressure regulator* doesn’t know the difference!
on February 05, 2018

It is *possibly* a failing ‘mass airflow sensor’ - *hands-on* testing by qualified personnel will be required - - including a fuel pressure TEST.

Good luck with it!
on February 05, 2018
LOL, That is what has me baffled as well! The car starts just fine for a few seconds only, then dies. Fuses all checked ok, Coil is getting continuous power, plugs are getting continuous spark. Fuel pump keeps running. With the key on there is pressure in the injector rail (8-12psi). Rail has 12psi static, and 8psi as you crank.
on February 05, 2018

Read all post again.
on February 05, 2018
Thanks, I'll test the MAS.
on February 05, 2018

*That ain’t enough fuel pressure* ... Better check the fuel pump ‘relay’ also.

I’m thinking the relay is under dash on passenger side .. white in color.

It is near impossible to repair a vehicle ‘online’ .. Too many details get lost in the translation!
on February 05, 2018
Thanks, I was thinking it was low for this type injection system.
on February 05, 2018

Well we’ve just about used up this page so keep me informed of the progress.

Again - Good luck!
on February 05, 2018
New fuel pump delivered 43psi to the rail, car ran without stopping, but hard restart. Checked residual pressure, it was still dropping to zero after the engine quit. changed the fuel regulator. Now I have 43psi running at idle, 50psi fast idle, and 34psi residual pressure for 20min after stopping the engine. Car operating normal now. Thanks for your help
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