Q's about diesel fuel delivery...

[NOTORIOUS VR]

hey what's up guys...

my buddy just bought a new winter beater (minus the motor)... it's a B3 Passat Wagon Syncro, and we will be swapping in his 1.6L TD from his Jetta.

The question is, what to do about the existing fuel pump?

I believe it's a single in-tank pump as it was originally a G60 which ran EFI.

Would it be okay to run the in-tank pump to "push" fuel to the diesel pump? or should it be removed?

And if it should be removed, any suggestions on a conversion?

Also, will the fuel pump be ok w/ the water separator inline?

thanks!

[QuickTD]

The G60 pump is pretty high pressure, it'll likely put up 60+ psi which would affect timing control in the injection pump and might squeeze out the front shaft seal. The sending unit comes apart and the pump can be removed, I'd remove it and just extend the lines for the fuel pickup to the bottom of the tank using some nylon or polyethylene (stiff hose). You could also get fancy and mount a low pressure transfer pump in the tank in place of the original. Any tuned VW diesel will benefit from a small amount (5-10 psi) of pump inlet pressure.

[NOTORIOUS VR]

for a low pressure pump... could I use a stock VW transfer pump? like with the CIS cars? or is that still to much pressure?  Or should I use say a carb. pump?

[QuickTD]

Any pump that puts up 5-15psi works fine. I use one of those universal solenoid pumps from NAPA. Its meant for for a carburated gasser, rated 8psi.

[Darkness_is_spreading]

If you were to run a T fitting between the inlet to the Injector pump, and to the retun line to the tank,  would that be an effective bypass,  ie having pressure on the line running to the tank and to the retun pipe from  the injector pump.

Will this affect the pump operation, or will this extra pressue on the return line benefit the entire system.  

The way I look at it is, you will have constant pressure to the injector pump, and will not dry feed it if it is a High Performance Giles pump.

[andy2]

I've got my ISB cummins feed pump (11-12psi) powered up switching the ground using the oil pressure switch (filter head).Its a safe way of hooking it up that way if you don't have oil psi then there is no problem as compared to having it on switched power.Think safe :wink:

[burn_your_money]

CIS pump puts out around 90 PSI I think, you would not want to use that