loss of diesel back preassure over night

[Bigwheeler]

Hi, I have a MK7 2.2 16 seater minibus which I use to teach D1 in, use to always be a good starter but lately its taking a lot of cranking to start, once started it ok for the rest of the day.

I have changed the fuel filter and housing as I was advised perhaps it was allowing air back into the system, but that did not improve the starting.

What I have to do now is to turn the ignition on, leave it for 10 minutes and it starts first time, so its obviously a fuel problem.

is there some way i can fit a non return valve on the fuel pipes or is there an easier fix

thanks for any advise offered.

[knobby1]

Hi, I have a MK7 2.2 16 seater minibus which I use to teach D1 in, use to always be a good starter but lately its taking a lot of cranking to start, once started it ok for the rest of the day.

I have changed the fuel filter and housing as I was advised perhaps it was allowing air back into the system, but that did not improve the starting.

What I have to do now is to turn the ignition on, leave it for 10 minutes and it starts first time, so its obviously a fuel problem.

is there some way i can fit a non return valve on the fuel pipes or is there an easier fix

thanks for any advise offered.

Year model..?? Assuming it's a Euro-5 RWD....?? If so, check the in-tank pump is working properly...it should have fuel up to the HP pump essentially straight away once the ignition is turned on.

If it's a Euro-4, you may have air ingress elsewhere in the low pressure side of the fuel system, this allows the fuel to siphon back to tank, leavin gthe system full of air.

Lord Knobrot (Smithy)