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Matt
Matt, Engineer
Category: Car
Satisfied Customers: 21864
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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I have a 1980 Bentley T2 as as I'm driving it's OK and runs

Customer Question

I have a 1980 Bentley T2 as long as I'm driving it's OK and runs great but when I shut it down it doesn't wanna start till it cools down but if i managed to start it while it's warm it will drive for a mile or two then it will shut down
Submitted: 10 months ago.
Category: Car
Expert:  Matt replied 10 months ago.

Hello

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

And one other thing to try is to loosen off the fuel filler cap, as there’s a 1 way valve built into the cap to let air into the tank and so prevent a vacuum from being created as the fuel leaves the tank to the engine

If this helps then replace the cap with a new item

Expert:  Matt replied 10 months ago.

Hi

do you still need help?

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