Fuel Filter Leak Problem

[Andy The Bubble]

Hello All

1.9 TDI (AUY) 115PS

I replaced my fuel filter, like guided, however when the pump is primed on ignition, I noticed a leak coming from the control valve. With the engine running, then obviously the problem gets worse. And so to try and solve the problem....

1) I replaced the o - rings, and so they are good.

2) I replaced the clips securing the pipes onto the valve.

3) Looked at the control valve itself. Noticed it intermittently allowed flow through. The valve does seem to respond to a pressure change, when blowing along the top pipes.

So I'm hoping it's this valve which I'm replacing soon.

Does anyone fully know how the system works?

I have understood that the valve allows return from the engine pump, to go through the filter and back to the engine, when under a certain temperature. This helps cold running, etc. However does this also act as another function?

Any suggestions?

[sherlockuk]

Not too sure if this will help, but I had a problem with fuel leaking from the top of the new filter that i fitted. Mine is an AVF 130bhp diesel.

Turned out that the new 'o' rings that had been supplied with the filter were the wrong size, just allowing fuel to leak out. Was wondering why my mpg was fine, but my fuel tank was emptying at an alarming rate of knots! Anyhow the dealer just gave me another set which properly fitted! I assume that the thing the 'o' rings were for was a valve, although I can't be sure.