Leaking Banjo Fitting at Bendix Pump Inlet

[NeunElf]

I found that had a fuel leak at the inlet to my Solex-carbureted 1965 911's Bendix Fuel Pump which has HBD Products Bendix Fuel Pump Banjo Kit. This is the fitting, which is the inlet. It's a fairly fast drip, too--at least it's a drip, not a stream.

Tightening it didn't solve the problem. Brad Davis at HBD kindly sent me a new fitting and new fiber seal rings, but that didn't solve the problem either. I even changed the fuel line,

Only the banjo fitting itself gets wet--I'm pretty sure fuel isn't leaking where the banjo fitting meets the flexible fuel line.

The mating surfaces look flat; is there anything else to look for?

Would changing the Bendix fuel pump be worth a try?

[sithot]

Ed Mayo sells a pump and will (if you ask nicely) install correct banjo bolts + new banjo fittings so it will look original.

Didn't your car come with a Pierburg dual pump?

[NeunElf]

Solex-carbureted 911s have both an electric Bendix fuel pump and a mechanical Pierburg tandem pump.

The Pierburg tandem pump circulates fuel from the float chambers in the intake manifolds to the carburetors where the excess fuel overflows back to the float chambers.

The Bendix pump draws fuel from the tank and pumps it into the float chambers.

I have a spare Bendix pump but it's untested (and it's wire's to short).

[sithot]

The Pierburg is an interesting setup to be sure!

Here's a post front the fuel pump thread. Worth reading.

http://www.early911sregistry.org/for...l=1#post627449

http://www.early911sregistry.org/for...l=1#post670523

[NeunElf]

I pulled the Bendix pump out of the car. I looks like the problem was that the bolt for the banjo fitting bottomed without completely sealing.

I took out a 14 mm socket and a breaker bar and made sure the banjo was tight. Early resting shows no leaks.

I also extended the power wire on the spare Bendix and cleaned up the dull plating on the original. It did cost me the yellow and red sticker; I'll have to see if I can find another one in my collection. If not, I know several sources.

Has anyone succeeded in re-plating the zinc or cadmium on a Bendix fuel pump?

[Cairns888]

This is the stuff I use on all fuel banjo fittings. Clean area, apply, fit together, torque up, wipe down, pressure test, job done.

Thanks

Jim