help please

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13 years 4 months ago #14157 by skipper928
Replied by skipper928 on topic help please
I did that with a bit of gas in a spray bottle, it tried to run but i couldn't keep the spraying up to get it to fire over completly. It seems like it wants to run. How much noise does the fuel pump make when you turn on the key.

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13 years 4 months ago #14160 by Kiln_Red
Replied by Kiln_Red on topic help please
Your car has an L-Jetronic fuel injection system, so the fuel pump doesn't run when the key is turned to the ON postition. It only runs after the starter is engaged. Have a helper kneel at the rear of the car while you try to start the car. Also, you should hear the pump continue to run for a moment after the starter is disengaged if a helper is not available.

Or...

You can remove the ball cup from the end of the passenger fuel rail. Be careful not to lose the ball. Fit a water bottle, or something similar, over the end of the rail and roll the starter over for a few seconds. If there was fuel in the tank and the pump were running, then you will have fuel in the cup unless a fuel line were collapsed or blocked (not at all likely).

Is the fuel gauge working or is it stuck at one level?

Try this and report back when you have confirmed whether or not the pump is good or not.

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13 years 4 months ago #14219 by xstepson
Replied by xstepson on topic help please
Austin,
I thought that all the 928's fuel pump ran for 3 seconds with the key first turned to the on position, but after that, the starter being engaged or the engine running was necessary for continued fuel pump operation. Am I mistaken?

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13 years 4 months ago #14220 by Ducman82
Replied by Ducman82 on topic help please
^^^^ that is correct. the pump should make a "priming" noise when the key is turned to the IGN hot, before cranking. thens stops. starts back up when the starter engages.

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13 years 4 months ago #14221 by Kiln_Red
Replied by Kiln_Red on topic help please

stepson;14585 wrote: Austin,
I thought that all the 928's fuel pump ran for 3 seconds with the key first turned to the on position, but after that, the starter being engaged or the engine running was necessary for continued fuel pump operation. Am I mistaken?

Ducman82;14586 wrote: ^^^^ that is correct. the pump should make a "priming" noise when the key is turned to the IGN hot, before cranking. thens stops. starts back up when the starter engages.


Not so on L-jet, LH 2.2, or LH 2.3..

If you want to see for yourself, open up the passenger fuel rail. Place something there to catch fuel and turn the key to ON. Look and see how much fuel is collected.

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13 years 4 months ago #14222 by wallyp
Replied by wallyp on topic help please
The earlier cars with the expensive fuel pump relay that contains an electronic circuit do run the pump briefly when the key is turned on, and then run the pump when the circuit sees ignition pulses.

The later cars with the standard "53" relay run the pump only when commanded by the ECU, based upon ignition signals.

This often means that the earlier cars may fire just a little bit sooner, as the later cars may need a few engine turns to build fuel pressure, while the early cars start building fuel pressure even before the engine turns.

Wally Plumley
928 Specialists
www.928gt.com

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