Omega starting problem

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Wed 2 May 2001 10:19
Omega starting problem - Vin Kennedy
I have an intermittent minor problem with my Omega (2.5V6). When I park for between half an hour and a couple of hours, I often find it takes a while on the starter to restart the car. Just to complicate the mystery, it only seems to happen when I go forward into parking spaces (i.e. rarely) and has never happened when I reverse into one. This may, of course, be an utter red herring.

Anyone got any clues? I suspect fuel vapourisation, but don't know what I can do if it is.
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Wed 2 May 2001 13:26
Re: Omega starting problem - Don Cox
Vin
The way these things usually work is, the fuel pump runs for 2 seconds after ignition turn on to pre-pressurise the fuel system.
There is a pressure limiting valve on the end of the fuel rail which will dump surplus fuel back into the tank via the return pipe. I would expect the rail to reach the relief pressure during the 2 seconds run. Cranking will start the pump again to replace fuel pressure lost through the operation of the injectors. The pump runs all the time the engine is running normally.
The question you need to answer is: does the pump run on ignition turn on? if it doesn't the pump relay is suspect, if it does then I would lean toward an ignition problem. The fuel pump is usually situated in the vicinity of the offside rear wheel and, especially if the car has doen a few miles, can be heard buzzing when running.
Regards
Don Cox
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