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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21607
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My vauxhall vectra will not start most of the time

Resolved Question:

my vauxhall vectra will not start most of the time
Submitted: 9 months ago.
Category: Car
Customer: replied 9 months ago.
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Customer: replied 9 months ago.
i have changed the fuel filter, maf and cam sensor, when it does start or about to start it is like it is not getting enough fuel, but it will only rev to 4 k when driving
Expert:  Matt replied 9 months ago.

Hello

I'd agree that this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.

1st thing to try is to remove the fuel filler cap and then flick the ignition on whilst listening for the brief ‘buzz’ of the pump

If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,

Ideally measure the pressure at the injector rail (should usually be around 3Bar / 45psi +) and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

You can also get this issue with contaminated fuel , if there’s water or dirt in the tank then either the petrol floats on top of the water or the filter sock on the pump is choked up – so if the other things check out then I’d consider pulling out the fuel pump and cleaning the filter sock

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