I have an 86 240DL SW last week it left me stuck in a parking lot overnight. The next day before i had to tow it I had checked to see if i was getting fuel. I pulled the the fuel line at the rail and was getting no fuel to the rail. After I had got it home I started checking fuses and grounds all fuses seem to be ok. so i replaced the relay and tried jumping fuses 4 and 6 and still got nothing. SoI took a jumper wire directly from the battery to the main pump and it started right up. Pulled the jumper off and it died in a second or two.i reconnected the fuel pump and it started a half of dozen before it went back to a no start condition. Now i am at a complete lossany help would be appricated.

 

BTW I CHECKED FOR POWER AT THE RELAY AND HAD 11.5 VOLTS. CHECKED THE FUSE BLOCK AND HAD 10.9. AND AT THE CONNECTOR FOR THE MAIN FUEL PUMP THE FIRST TIME I CHECKED I HAD -000.5 THE NEXT TIME I CHECKED IT I HAD 005.4 IT WORKED WHEN THIS LITTLE AMOUNT OF VOLTAGE WAS PRESENT THEN DIED CHECKED AGAIN AND IT WAS BOUNCING BETWEEN 13 AND 2 VOLTS.

 

NOW I AM HAVING OTHER PROBLEMS AS WELL. NOW MY STARTER SOLENOID IS ENGAGING BUT NOT SPINNING. I TRIED TO JUMP THE STARTER FROM THE BATTERY AND GOT IT TO TURN A LITTLE BIT BUT NOT ENOUGH TO TURN IT ALL THE WAY OVER. I AM PRETTY SURE I AM HAVING WIRING ISSUES. I KNOW THAT IPD HAS A ENGINE WIRING REPAIR HARNESS. HAS ANY BODY EVER HAD SIMILER PROBLEMS OR REPLACED THIS HARNESS IF SO DID IT FIX IT AND HOW DIFFICULT WAS IT TO REPLACE?

 

Almost all 240's have wiring problems.
Harness is time consuming to install.