But if there is any chance of vapour lock, it's better to place the filter between the pump and the carburettor.The Wolfsburg engineers, in all their wisdom, have solved the problem on their newfangled water-pumpers by fitting a small bleed back to the tank off a T-piece near the carburettor inlet.What happens is that the fuel in the inlet line to the fuel pump boils, due to the heat it has picked up from the hot engine pieces surrounding it, and the pump will not seal well enough around hydrocarbon gases to pull liquid fuel through, hence no fuel delivered to the carburettor.

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Do you know how long you've got to turn the motor over if your tank runs dry?

If your battery is at all dodgy, it might make the difference between starting and not starting.

Don't fool with any factory-designed thing like this unless you have as much theoretical knowledge or practical experience as the designers, or are prepared to learn from your mistakes. Not to the aid of the owners; they deserved to be shot, but to the aid of the Volkswagens, because I have more respect for them than people who work on cars without knowing what they're doing (do you stop when you see a VW on the side of the road?

) On both occasions, the cars had vital pieces of cooling tin or rubber missing, and the engines had become so hot that the fuel in the lines near the engine had vaporised.

There are a few more advantages to having an electric fuel pump which I have neglected to tell you.

That "toc-toc-toc" or "mrrrrrrrr" is very reassuring, and is a powerful diagnostic tool.

Didn't they teach you in school that a liquid boils at a lower temperature when its pressure is lower? There is no reason why the filter has to be on the suction side of the fuel pump.