Loss of power on highway

Quote:

Originally Posted by toby oats

My fuel pump "whines" until it pressurizes and the then it is ok.
The sump does not show any evidence of diesel ingression - I had diesel in the sump with a cracked head years ago (replaced with a Turner (UK) head).

What gets me is that the vehicle starts up smartly and drives very well for about fifteen klms and then losses power and stalls - something builds up in the system and then fails and continues to re fail. Then next morning I can start it up without a problem.

It will be the copper washers that will have failed, letting combustion gas into the fuel system , the whining from the pump is because it's cavitating . Only failed O rings or cracked head causes the diesel in the sump problem, but obviously change the O rings at the same time .
It eventually gets to the point while you're driving that the pump can't pump, and the fuel galleries fill with enough gas so the injectors can no longer function.
Do it sooner than later as the pump will fail prematurely ( it doesn't like the acidity or the cavitation)

Quote:

Originally Posted by sashadidi

Fuel filter?

Yes, change the fuel filter when you do the injector washers