Quote:
Originally Posted by mikes2
My 90q 20v does prime the pump when you enage the ignition and it's very noticeable
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And the next time you get a 20V's fuel pump check valve out, you'll see why. There isn't one - no 20V engine maintains residual pressure - that's a feature of CIS but not EFI (in any form).
I was recently stymied for a while by a WR that wouldn't start. Well, actually, a very large and well-known Audi dealer was stymied by it. When I put the fuel pressure gauge on, the residual pressure died as fast as the needle could move. The reason was that a 20V fuel pump had been fitted, and the adapter on the end of the pump contained no check valve - so the fuel accumulator powered its contents straight back into the tank when the fuel pump stopped.