VW 2006 Caddy SDI won't start facing uphill, and cuts out at roundabouts


New member
May 11, 2020
Hi there everyone,

I have a 2006 2.0L SDI Caddy, BST engine at 146K miles that has these two problems:

  • When parked uphill overnight or for a few hours it fails to start in the morning, it cranks but doesn't start. I think there should be a leak somewhere allowing air in the fuel line draining the fuel back in the tank. Parked facing downhill the van starts no problem.

  • When slowing down, say approaching a roundabout, the engine cuts out, with engine cold or hot or anything, it seems like temp doesn't matter. This happens onl if revs are above 1200rpm, while braking and changing to neutral to get to a stop. The revs hand dives in all the way from 1200rpm to 0, with power steering getting heavy and all that. A turn on the key and it fires it up straight away no problem. Sometimes this is not even necessary as if the van is still in motion, as selection to 2nd gear can bump start it back to life super easily. I have also noticed that if I clutch down this cut out won't happen at all.

I don't know if these two problems are interlinked or separate, and I would like your ideas, as I cannot afford to start changing parts until I figure out what's wrong.

So far I have taken the car to 2 garages, both plugged it in that showed no errors, first guys changed the fuel filter that was found in an awful black state, but this didn't resolve any of the problems, and the second a VW specialist put new injector seals on, saying they would look at the tandem pump next if still the problem remains, which it does.

Any ideas, as this is driving me crazy!




Super Moderator
Staff member
Jun 4, 2012
Stoke on Trent UK
First posts normally go in introductions else you could get a free fix and we never see you again!!!

Manufacturer: VW, Date(s) Used: 06/2005-05/2008, Model: Caddy/Caddy Maxi, Engine Code: BST, 51Kw, 70PS, 2.0 Ltr, 4 Cyls, Remarks: Suction Diesel Injection (SDI) Timing belt

What did this garage use to scan for error codes a generic scanner?

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.

Thread approved.


New member
Feb 1, 2017
Stonehouse UK
Hi I had starting problems with my 2009 Caddy 1.9 SDI the garage tried everything, until I realised that it was ok after topping up the tank, there after every time it struggled to start I topped the tank, problem solved, garage explained it as a faulty lift pump in the tank.

I fill up every time it gets near half full.