CWO4Mann

Hola El Groupo! I've reported here the exercise in cleaning out the fuel system on Kryptonite. Dropping the tank, pulling the hoses, fuel pump "repair", injector cleaning and testing.

I wanted to bring you up to date on today's little activity.

Previously I blasted everything out with kerosene and an air hose, so the fuel delivery system seems clean. I haven't yet put the tank back into position, since I have some penetrating rust back there and need access for the bondo

I connected the fuel pump to a 1200ah gel-cell battery, hooked some tubing to it, one tube in a 5-gallon gas can and the other hooked to the rear external fuel filter. Pumped it up nicely and she started up with only a little cranking. When the engine went to idle, I inspected the engine and sure enough there is an oil leak at the front center of the engine. Looks like the oil cooler hose connection.

Meanwhile, I smelled gasoline, so I snuck around the rear and danged if the fuel pump wasn't leaking a fine misty spray out of the seam where the top of the unit is press-fitted into the body of the pump.

After that adventure, I pulled the pump connection -- forgetting the pressurization -- and got the water hose effect from the fuel line.

Looks like the next step is an attempt to seal the fuel pump but I am counting on probably having to buy one.

Ahh, adventures in Porsche 928 Plumbing.

Cheers,

Dennis Wilson

Dave,

Concerning the leaking fuel pump, you might try a fuel resistant sealant wrapped with a thick, flexible (elastomeric) tape. Then securing it with a hose clamp. Considering the amount of pressure, it is doubtful any patch will last very long.

Dennis

SharkSkin

Nice going Dave! You finally got Kryptonite to growl.... Sounds like it's time for a new pump, so we don't have you in here posting a car-be-que thread...

Mrmerlin

If your shure it is a laky pump then dont hesitae to get a new pump on board, But if it could just be a leaky hose connection then you may not need a pump, some times the pump sealing rings will let just enough gas out to make the pump look like it is leaking when you just need new sealing rings, Oh as a side note dont drop the pump you can crak the internal magnets and cause the pump to freeze up or the debris to go to the injectors/fuel filter, Stan

CWO4Mann

Thanks you all for the recommendations. The pump works great -- I discovered when I was still in the cleaning out mode that it will shoot a 1/2" stream of dirty brown kerosene almost 2 feet in the air and that the kero when on the epoxy-sealed floor of my shop makes said floor slippery than owl-poop as we say here in the South.

The pump makes pressure and runs with almost no noise. The problem is that the crimped end is leaking every so slightly around where the crimp is made. I have the pump drying out right now and I am going to gently reform the bead with a jewler's hammer, then inject a miniscule bead of fuel-resistent epoxy around the crimp. I am hoping that once the epoxy infiltrates the crimp it will make a pressure-secure seal.

I have got to order a fuel pressure guage ... I just remember that.

Merlin, when you mention the "pump sealing rings" I am not sure what those are. My pump is a sealed unit ...

jeff jackson

Merlin is referring to the copper sealing washers that are situated on either side of the discharge pipe "banjo" fitting...and are secured by the end cap... lots of times...when the fuel filter is replaced, the pump discharge end cap and banjo fitting are disturbed enough to cause a significant fuel leak upon restart of the pump...this is why the copper washers, are typically replaced or at least checked, when the pump or filter or serviced. I had this same experience...and had to remove the entire pump / filter / bracket assembly, to get sufficient tightening torque on the end cap, to prevent pressurized fuel from spraying when the fuel pump operated. I think in my case..the 3rd time was the charm. I was really pretty happy when I finally put that "simple" fuel filter replacement....to bed. Oh well...live and learn...

FlyingDog

Good job on getting it running. The oil cooler lines connect to the engine on the side, right in front of the oil filter and next to the alternator.

CWO4Mann

Ah, yes now I know what you mean. I pulled all of the fittings apart and disassembled teh banjo/check valve. The check valve was full of crusted, rusted, ka-ka and I gave it one hour in an ultrasonic cleaner. The copper washers looked and worked fine, it was at the top of the actual pump body that fuel was spraying outwards. I am going to try the epoxy sealer this weekend.

Thanks!

CWO4Mann

Well then, I don't think it is an oil line. I'll snap some pics tomorrow and check the WSM. Since it is on the front of the car, it will be this summer before I actually do anything about it, when I pull the engine.

Cheers!