Hi,
I'm having a problem with my 1998 300tdi. Slow to start, sits fine at idle, dies on acceleration. Sounds familiar, simple fix, change the lift pump.
But no! Lift pump changed, no difference. So changed fuel filter, air filter, oil filter (not related but I was in a filter mood). Engine starts slowly runs on idles, dies on acceleration.
Possible dodgy replacement lift pump? Off it comes and another one put on. Tested both for blow/suck on activating the pump lever. All good.
Start it up, fine on idle, (you know where this is going) dies on acceleration.
So I crack the banjo bolts on the fuel filter and there's a healthy flow coming through. Checked the bleed screw, expecting some bubbles then fuel. Nothing coming out at all. I take the bleed screw out completely, still nothing. Out of curiosity I put my finger over the bleed hole and there's positive air pressure building up behind it. So much so that it gives a good hiss when I take my finger off, like if you had your thumb over the end of a bike pump...
There's no obvious drips or leaks, of fuel anyway!
Any thoughts on what could be causing my issue or whats next in the check list?