johnu

After months of working in the garage, and numerous setbacks as well as some small victories, I am almost finished my intake refresh.
I want to test for fuel leaks without running the engine. Does someone have a quick explanation on how to pressurize the fuel system?

Thanks
John

firemn131

I just connected everything and ran a fused/switched jumper between the 30 and 87 terminals IIR (There are tons of information for the jumper) on the FP relay. I would depress the button and hear the pump pressurize and look and smell. I did this about 15 times over a few days to be sure. I even had fresh noses come look.
I put news paper on the ground to keep a look out for leaks. I also pre positioned news print under the lines near the fire wall. You could put a gauge on to see if pressure is steady, but I thought that would be a bit of overkill.

johnu

Any way I could pull a fuse and or relay to prevent ignition while cranking the engine over?

Leon Speed

No need to crank the engine over. If you bridge the fuel pump relay and you turn the igniton to on, the fuel pump will run. You'll hear it. No need to crank. Let the pump go for 5 seconds, then remove the bridge. Run fingers along the connecting areas and feel and smell for gas. If all is clear, let the pump run for few minutes and check again.

You'll want to pull the ingition relay and fuel pump relay or fuse if you want to build up oil pressure before starting.

johnu

Been doing some more reading and came up with conflicting info. Does the fuel pump run with the ignition off when jumpered?

GregBBRD

"30" power, in all Porsches (VWs, Mercedes, and BMW) is direct battery power.....12 volts, all the time.

Connecting "30" to "87" in the fuel pump relay socket will make the fuel pump run, with your key inside the house, unless the fuse is blown, the pump is bad, or the battery is disconnected or dead.

Schocki

Disconnect the LH und EZK connectors at the brains before. If you make a mistake jumping the relay, there is a chance that you fry them otherwise.

johnu

Thanks
John