thehutchies
Free Member
Tell you what..
You can try clamping the fuel return pipe to test if the increased fuel pressure at the Carb improves performance. Some people block off the return pipe completely (and remove the "T" piece) which is acceptable provided you block the return pipe to tank in a very secure manner with no risk of spillage (even if the vehicle is inverted) or vapour escaping..... It is worth noting that the "T" piece has a restriction built in (on my 1991 model at least), i.e. one of the pipes is much smaller internal diameter than the others. This is the case on my 1991 Vehicle and the narrow pipe is the one to which the return pipe to the tank attaches.
This is an issue that had a lot of discussion on other forums.
As the van is fairly new to you, check that the fuel return pipe hasn't been replaced.
If it's a much wider diameter than the original, it causes poor running as there is too much unused fuel being returned to the tank.