Fuel line re-routing

[Mr Sheen]

I believe it’s a common problem (I could be wrong) that after a long drive once the engine is up to temperature, stop for a break and switch the car engine off. Re-start the engine and the engine just turns over but doesn’t fire.

I’m told that the fuel line under the car gets too hot and that the fuel evaporates, am I right?

Has anyone else had this problem and if so how did you re-route the fuel line?

Thanks for any input

Andy

[MJG280]

Just after the fuel pump there is the fuel accumulator which maintains the pressure within the system for up to half an hour so that the pressurised fuel in the pipes feeding the injectors will not vapourise. This is supposed to be enough time for the engine area to cool down. Mine works for about 10 minutes and so after that you have to keep turning the engine over but stopping and starting every 3 seconds otherwise the relay will turn the pump off.

I keep thinking I should fix it but sometimes it's ok for ages so if I can I leave the bonnet open to cool the whole thing down. I must really fix it sometime.

Edited by MJG280 on Friday 15th September 12:06

[GreenV8S]

MJG280 said:

Just after the fuel pump there is the fuel accumulator which maintains the pressure within the system for up to half an hour so that the pressurised fuel in the pipes feeding the injectors will not vapourise. This is supposed to be enough time for the engine area to cool down. Mine works for about 10 minutes and so

I've never seen anything like that. You may be looking at the fuel filter. The system holds pressure because the pressure regulator and the pump are both relatively well sealed so the circuit between them stays pressurised. This is a simple consequence of the way these two things work and not something that was done deliberately to make the system hold pressure.

If you have trouble with the fuel boiling in the fuel rail, you may find it helps to lag the rail. On mine that helped cure rough running problems when the engine was restarted when hot.

[wedg1e]

GreenV8S said:

MJG280 said:

Just after the fuel pump there is the fuel accumulator which maintains the pressure within the system for up to half an hour so that the pressurised fuel in the pipes feeding the injectors will not vapourise. This is supposed to be enough time for the engine area to cool down. Mine works for about 10 minutes and so

I've never seen anything like that. You may be looking at the fuel filter. The system holds pressure because the pressure regulator and the pump are both relatively well sealed so the circuit between them stays pressurised. This is a simple consequence of the way these two things work and not something that was done deliberately to make the system hold pressure.

If you have trouble with the fuel boiling in the fuel rail, you may find it helps to lag the rail. On mine that helped cure rough running problems when the engine was restarted when hot.

He's quite correct Peter: on the V6 there is a fuel accumulator for the mechanical injection system. However the V8 cars don't use it... so you're right too