850 tdi woes

john-sussex · Jul 24th, 2022, 21:24

P plate tdi, fitted with slightly later V70 lump, Vw unit. Having running issues, keeps rough running and cutting out. changed filter, and pipe from filter down to pump. still no joy. The one thing we have noticed in the clear pipe running over the pump has air bubbles in it, they clear once the engine is tried, but has a long crank. once the engine is stopped the bubbles return. not really up on the fuel system on these, more of a petrol man.. tia

darroch · Jul 25th, 2022, 12:53

Make sure you are using proper hose clips rather than jubilee tpe as they don't seal well on fuel systems. There is a bit of knowledge on that engine around on the Volkswagen forums. Auto****e had a few rebuilds on it too.

Baffler · Jul 25th, 2022, 16:23

Have you replaced all the copper washers on top of the fuel filter housing?

Jul 24th, 2022, 21:24	#1
john-sussex Member Last Online: Apr 23rd, 2024 21:17 Join Date: Oct 2006 Location: storrington	850 tdi woes P plate tdi, fitted with slightly later V70 lump, Vw unit. Having running issues, keeps rough running and cutting out. changed filter, and pipe from filter down to pump. still no joy. The one thing we have noticed in the clear pipe running over the pump has air bubbles in it, they clear once the engine is tried, but has a long crank. once the engine is stopped the bubbles return. not really up on the fuel system on these, more of a petrol man.. tia

Jul 25th, 2022, 16:23	#3
Baffler Premier Member Last Online: Yesterday 23:43 Join Date: Dec 2002 Location: Co. Limerick, Ireland	Have you replaced all the copper washers on top of the fuel filter housing? __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

Jul 25th, 2022, 12:53	#2
darroch Junior Member Last Online: Yesterday 20:44 Join Date: Aug 2021 Location: paisley	Make sure you are using proper hose clips rather than jubilee tpe as they don't seal well on fuel systems. There is a bit of knowledge on that engine around on the Volkswagen forums. Auto****e had a few rebuilds on it too.

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