Fuel Pump

[Peter Burger]

I am about to rebuild the mechanical fuel pump in my 64 C. Once that is done and the pump is back in the car, I plan to check the fuel pressure.
What would be the best way to adjust the pressure - up or down?

Thanks
Peter

[Wes Bender]

Unless you stretch the spring that pushes the diaphragm to pump fuel, there's no need to adjust the pressure, either up or down.

Wes

[Craig Richter]

As per the manual, adjusting fuel pressure is done by adding/subtracting flange gaskets. There is a big O-ring on the pump body to stop leaks, so no need for goop on the flange or gaskets, which makes this (rarely needed) adjustment a pretty easy chore.

[C J Murray]

The late pump doesn't get adjusted. It just relies on the fixed stroke of the cam.

[Dick Weiss]

There have been time where the pump output pressure exceeded 3-PSI and shim gasket(s) would be necessary to
get 2.4-to-2.8 PSI (3 is max.) I've done a couple and the late Ken Daugherty solved a 'high reading yrs. ago.
When re-assembling the pump, make sure the diaphram is flat to it's mating surface before adding the top pump 1/2.
Yeah, I know you'll need a low pressure gage--mine is 0-to-5; You might find one @ a hydraulic supply/repair shop.