Koenig-Specials 928

On holidays 300 miles away. On the way I encountered a no start at a gas station. Fuel pressure gauge showed no pressure even during cranking. All fuses checked ok and several swaps of the relay with several new ones from Roger did not work. Tried jumper on 30 & 87 terminals and completed trip to destination.

At the relay, #30 has battery voltage and #86 has ignition and cranking voltage. When #87 gets juice the fuel pump runs (as described above), so is the relay missing a ground off the #85 terminal? I traced the grey wire on #85 terminal to the bundle at the bottom rhs of the CE panel.

So what is fed to the #85 terminal at the fuel pump relay to get the relay solenoid to close? I don't want to connect a ground to it without first checking with you folks.

Please and thanks!
Fred

soontobered84

Fred,
I hate to be the bearer of bad tidings, but the LH not providing ground to the fuel pump relay is a sign that your LH needs to be rebuilt. It has happened on both LH computers that have gone bad on my cars.
I drove with a long wired switched jumper for the fuel pump for a month until I could get the computers rebuilt.

Koenig-Specials 928

Thanks John. I suspected that was the case but was hoping it was something else. This afternoon I removed the FP relay from its socket and made up a 4 pin relay test rig with 12" leads and plugged them into #86, #87 and #30 terminals of the empty relay in the CE Panel. I then connected the #85 terminal on the test rig relay to ground. The car starts and runs but I know the fuel pump will run as long as the ign is on (bad in an accident scenario). As you noted this will buy me some time to have a look at the LH.