Does The Pug Fuel Pump Have A Non Return Valve?
Just to break this off from the other thread and ask a specific question.
1) Does the Bosch fuel pump in the pug have a non return valve / check valve?
I have been looking at the Bosch site, specifically their spec sheets but can't get a straight answer, because they seem to have streamlined their range from 72 to 7 pumps and are using adapter kits.
2) If so is the check valve external to the pump or internal?
3) Has anyone here either got an FPR with a pressure gauge in it, or done a fuel pressure drop test? if so how long did it take for the pressure to drop from 40psi to nearly zero.
(its the test where you switch the engine off and watch how the residual pressure in the rail decays)
failing that
4)would someone fairly local to maidenhead with a 205 be kind enough to pop round so we can stick my gauge in line and run it up to test what happens when the engine is switched off.
Answers to these questions would be Most appreciated.
Cheers
j
It's turning over and over when it's hot, taking a while to start, there is more information in this thread.
Basically when you turn the engine off, fuel pressure drops immediately to zero, it should be maintain pressure at approximately 20psi, ten minutes later.
Running the pump manually, it takes time to fill the rail with fuel, stop the pump and the fuel runs back into the tank leaving an air pocket at the rail, it would seem to loose pressure immediatly and then over time the rail will empty and fill with air.
I'm 1000000% sure the fuel rail, FPR, fuel lines etc are not the problem, because i've systematically tested everything with painstaking detail over the past few weeks. however the bit that really confused me was when manually pressurising the fuel line from rail to pump with a foot pump it held pressure. So i was thinking that it might be an electronic valve.
so if you're pretty sure that the valve is in the neck, and it's not electrical, then it looks like i need to change the pump... but i've done this once already, and it didn't make a difference.
confused.com