Apologies for posting on a main board but hoping for a quick response as I'm up to my arms in oil..... Best way on a Saturday

Problem started when my high quality britpart filter disintegrated at 2 months old spewing lumps of filter paper through my fuel system (cheapskate *********) 4 filters later she is now running but seems to have a bad low revs diesel knock and down on power a little , knock is bad as you pull away clearing as revs pick up, bad again as revs drop approaching a junction / stop ,

I'm thinking either another filter change in case the last bits of crud have finally reached the filter or unrelated pump timing issue

Pump hasn't been touched but I know the smallest movement has quite an effect on a 2.25

Any ideas? Any set way to turn the pump when knocking like this or am I barking at wrong tree?

Also 2 people mentioned check the gauze filter on the cab pump??? I've removed the inlet banjo and large bolt behind but all that hides is a spring with a small plunger in the end? Does the cav have a gauze ?? I don't wanna remove much more n have a dozen springs n bits of metal make a bid for freedom

Bit stuck .... Wouldn't be an issue with a tdi but the 2.25 cav isn't something I've ever played with having v6 n v8 series in the past

Cheers Steve

If the DPA pump has bits of fuel filter inside, it can be that the advance/retard mechanism is jammed.

Although relatively simple mechanically, they are precision devices that need very clean fuel.

You only have one pumping element that works for every cylinder, so you need to keep that in good condition.

The hydraulic governor etc is also fairly close tolerance stuff and my suspicion would be that bits of filter or even worse have got into the pump.

Peter

if desperate I have brand new CAV injection pumps out here still in the wrapping if things get desperate let me know

CJ2a said:

if desperate I have brand new CAV injection pumps out here still in the wrapping if things get desperate let me know

Click to expand...

cj2a thanks for the kind offer, my brother works on mhe so has a few as well but if it does turn out to be past saving I think the 200tdi conversion will come forward a couple of months.... thanks for the offer though, much appreciated

cheers steve