Those pumps run directly off that fuse. A lot of current flows through them and they just bake after a time.

 

Check the amps on your fuel pumps. They may going bad and drawing more amps.

 

What is an easy, reliable way to test the apms from the pumps?

 

Poor socket connections lead to higher resistance and heat as well. A good mechanic or electrician will have a multimeter with the ability to check this.

 

I have ordered a new fuse panel. I noticed the fuel pump fuse connection is loose and appears weak and "burnt" All of the other connections are tight and I can not "wiggle" them or see wear. I have looked for just the single contact point, but I could only find the complete panel section for $ 100 at Pelican.

I really do not want to buy salvage parts.

 

What about this:
http://www.pelicanparts.com/catalog/...0161233300.JPG
It's the relay socket with harness on Pelican.

 

A good voltmeter will have the ability to check amps. Just make sure you have it connected correctly or you'll blow the fuse in the meter.

 

Read the technical article on Pelican re: rewiring the pumps to run on separate fuses. Mine suffered the same symptoms as yours prior to rewiring. It took all of about 30 minutes to rewire and has not been a problem since. A new fuse panel WILL fail in time if you do not rewire the pumps.

JP

 

Pelican article:

http://www.pelicanparts.com/techarti...amblings-2.htm

 

Check all of your grounds and connections on those pumps and the related circuitry. As stated earlier they draw a lot of current normally and its a weak design on the Porsche 930. The rewire at Pelican is a good alternative. Also make sure you got at least one spare fuze and relay in your glovebox at all times.

 

I am having similar problems with my 87 930, sometimes it will start and run fine, but lately, I hear what appears to be both fuel pumps coming on, I turn the key, the car tries to start but doesn’t. I tried the fix that was suggested above with the fuses to no avail, still looking for advice.

 

W W - Your problem is a different one if your pumps are running.

 

I just bypassed the #6 fuel pump fuse junction on the fuse panel.
The lower wire leading to the # 6 (from the windshield to the front of the car) fuse was burnt and the lower fuse box "pin" was loose and chared. I bought a simple "in-line" fuse from a car stereo shop with just slightly larger wire. Claned up my existing fuel pump fuse lines (at #6 fuse) and removed the "piggy-back" metal jump lead that joins the #6 fuse to the # 5 fuse and added a wire from the new in-line fuse back to # 5. I installed a 25amp fuse in the new in-line fuse, replaced both of my red relays and I have not had a problem yet.

You may also try to replaec your DME relay under the driver's seat
911-618-154-00-M76