no power to fuel pump fuse
- Thread starter 109diesel
- Start date
ptschram
Well-known member
ptschram
Well-known member
Thanks for the ideas. We routed power from another fuse to the fuel pump fuse. Still will not start. New problem; no energy at fuel injectors. The old rover will start if you spray fuel into engine. Could this possible be a ground problem or CPU?
ptschram
Well-known member
Replaced fuel relay and the one beside it (both under the front passenger seat; I believe the blue connector was the fuel relay.) Relays click after you energize them or turn the ignition switch on and off. The odd thing is the relays had power to them even though the fuel pump fuse (#18) did not when we were first trouble shooting the Rover. Rover has ran great until the other day, I started it, backed up, loaded a chain saw and some other gear drove about 60 feet and it just died. Had spark at plugs, checked fuel pump fuse it was fine, changed fuel pump relays, disconnected fuel line from fuel filter and no fuel. Replaced fuel pump, no fuel, found no energy at fuel pump fuse, ran power to fuel pump fuse from another fuse, got power to fuel pump, now no power at fuel injectors. Stumped.
ptschram
Well-known member
Th injectors should be hot 24/7, they are switched by the negative side by the ECU.
Please tell me you used the exact replacement relays.
Please tell me you used the exact replacement relays.
P.T. we replaced the relays with after market BDW relays with exact numbers, 30 amp. Cleaned grounds. On the fire wall noticed a missing relay and put one of the old relays in, rover started, ran for 5 seconds and died. turned key off and on, rover started again ran 5 seconds and died, repeats as described.
ptschram
Well-known member
Ooops! BWD 30 amp same pin configuration. Also placed a relay on a female relay connection on the firewall; this connector is on the passenger side, just to the left of the set of relays, it was by itself with two white wires and one black one the wires go through the firewall, it was just hanging there, not sure what it controls (and evidently it wasn't in use before). As said before rover started, ran 5 seconds then died. After a few tries she would not start, checked injectors with a light tester and light staid on, showing no pulse, verifying that fuel was constantly flowing to the engine, pulled plugs and cranked engine over until fuel was pumped out. Now I think it must be the ECU. PT, anyone, thoughts. Also would you buy a used or remanufactured ECU? We live way out in the country in Tennessee, so any help with getting the old girl running is graciously appreciated. Also a couple of years ago I replaced the 3.9, which had replaced the 3.5, with a 4.2 from a 93 LWB and it ran fine until the other day.
ptschram
Well-known member
Let's go back to the relay. BWD??? WTF is BWD?
Checking injectors with test light? Describe the process you used?
Worst case, remove the ECU, send it to me, I'll check it out and if good, return (well, I'll return it either way.
Do you have spark when this is happening? What's happening to fuel pressure when all this is taking place?
Checking injectors with test light? Describe the process you used?
Worst case, remove the ECU, send it to me, I'll check it out and if good, return (well, I'll return it either way.
Do you have spark when this is happening? What's happening to fuel pressure when all this is taking place?
ptschram
Well-known member
Alright, I see that BWD is a brand of relay.
Post up a pic of the schematic on the side of the relay.
Post up a pic of the schematic on the side of the relay.
cosmic88 said:
That was goign to be my question.....but it still remains that the truck doesnt start.....feedback from the dizzy is the black/white wire goes to the resistor near the ecu i had a break in that wire when i long ago had to diag mine......also are you positive you have full fuel pressure not sure with out a guage!
lets get this fixed and keep on using this awesome year classic!
ptschram
Well-known member
Guys, we're running around the barn here and gonna trip over something.
It's time to cue the Waylon and Willie and get back to the basics.
Did this problem just magically happen? What happened? Were you just merrily driving along and Whammo! Out of the blue, the truck quit running?
First things first, let's confirm we have the correct relays in those two relay bases.
It's time to cue the Waylon and Willie and get back to the basics.
Did this problem just magically happen? What happened? Were you just merrily driving along and Whammo! Out of the blue, the truck quit running?
First things first, let's confirm we have the correct relays in those two relay bases.
If you like Waylon and Willie check out the grandson of Hank Willams Hank III (his dad is Hank Jr. with whom he don't deal with.) Back to the basics. Here is the story. The weather report was heavy storms, since it takes about 40 minutes to get to work from our place in the rural mountains in Tennessee, I knew to take the old Rover and a chainsaw, tow strap etc. in order to get home, after the second shift that I work, not to mention the chance of high water across the road on the journey home. Rover was running fine, started it to go to work, backed up loaded my supplies for the trip. Started the Rover drove about 70 foot down our gravel road and it just quit running. Whammo ! Magically ! Just out of the blue. I parked it on the side of the gravel road, checked fuse to fuel pump, it was fine tried, starting no luck, ran the battery down, walked back to the house, got my little 94 nissan truck and used it as a hotshot for the Rover, no luck. Towed the Rover home back up the hill the next day with a borrowed big dodge 4-wheel drive truck. Checked spark to plugs it was fine. Noticed that there was no sound coming from fuel pump when I tried to start her, disconnected fuel line at fuel filter, no fuel when we turned the old girl over. Swapped relays under the passenger seat, no luck. Assumed it was a bad fuel pump. The engine was changed a couple of years ago we did not change the 13 cu to a 14cux. It had been running just fine. The light test on the injectors was done with a Snap - On brand injector light tester; connected at the injector, if light is steady, malfunctions of electrical system, light was steady. If working correctly light should have pulsed. Have good fuel pressure. Still jumping power to the fuel pump fuse, new fuel relays BWD brand from Advanced Auto, installed a relay where one was missing on the firewall, (never had one there before) and it would start and run for 5 seconds. Then it stopped doing that. Did the before mentioned injector test, took plugs out, turn Rover over until fuel pumped out of cylinders. That is when I assumed it must be the ECU. Will be glad to send the ECU to you PT, let me know your address.
ptschram
Well-known member
109diesel said:
The relays are special for that application,if they aren't right, the battery will die overnight and it won't run.
AFE2913L, if memory serves.
P. T. Schram
Schramelot
8620 E 300 N
Churubusco, IN 46723
pt@ptschram.com
Contact me ahead of time to ensure schedule availability and pricing to test.