Hey guys, I read through the stickies but didn't find an answer. This is a lot of info, but hopefully someone can help. I am new to this forum but have worked on cars as a hobby for 20 years. I am in no way an expert but not a rookie. I have a 99 XJ a 19 GX460 13 Tundra (supercharged) and this 89 62.
I picked up the 89 62 from Dallas a few months back, all original* (I'll get to this) with 250k on the clock. Cali car for 30 years with no damage or rust to speak of (except a spot right above drip edge). It started and drove ok on the 150 mile ride home... but painfully slow (I have been in 60s before, so not normal slow). One thing I noticed was the gauges all pegged intermittently on the drive home (Temp would jump to top of range, Fuel would jump to bottom of range) then come back to normal after a few minutes... seemed like a ground.
Fuel gauge would show empty at 3/4 of a tank.
Battery would drain after a few days (new battery, alternator works fine).
I was driving around town and everything went dead. I coasted to a stop. The truck would not start. I checked the fusible link (seemed ok) and the fuses. EFI fuse was blown. Replaced, blew immediately again, replaced, same thing. Got the truck home on a flatbed.
I did some research and assumed a ground in the fuel pump. I replaced the fuel pump, sending unit, fuel filter and pressure regulator. When I went to restart, the truck cranks but does not start. Seems the fuel pump is not getting power (0 volts across when key in any position). I wired the pump to the Lexus battery and it runs fine, so its not the pump. No EFI fuses are blowing now, and gas tank level works fine, but truck will not start. I even tried to start with fuel pump connected to lexus battery... no joy. I cranked it until the battery died and nothing. I charged the battery back and tried again... would not even turn over, no clicking, nothing. Let it sit overnight and it cranked in the morning, but would not start.
I traced the fuel pump wires (red and green and white and black) to the fuse block, and they are not getting voltage across them at any point downstream of the fuse block. However, measuring across the fuse location itself I get 12V on the EFI fuse fuse is good and I swapped it to verify). I also get 12V across "ignition", but only 6V across the "engine" fuse. The wiring is a bit of a mess under the dash as a previous owner installed a trailer wiring system (installed is used loosely) and an alarm system.
Does anyone have any idea what is going on? Why fuel pump is not getting any power and why engine will not start even with fuel pump powered externally? Why im seeing 6V across "engine"? And why this would happen suddenly? Also, EFI fuses are no longer blowing so I think I fixed that issue. So sorry for a long first post and I appreciate everyone's time.
I picked up the 89 62 from Dallas a few months back, all original* (I'll get to this) with 250k on the clock. Cali car for 30 years with no damage or rust to speak of (except a spot right above drip edge). It started and drove ok on the 150 mile ride home... but painfully slow (I have been in 60s before, so not normal slow). One thing I noticed was the gauges all pegged intermittently on the drive home (Temp would jump to top of range, Fuel would jump to bottom of range) then come back to normal after a few minutes... seemed like a ground.
Fuel gauge would show empty at 3/4 of a tank.
Battery would drain after a few days (new battery, alternator works fine).
I was driving around town and everything went dead. I coasted to a stop. The truck would not start. I checked the fusible link (seemed ok) and the fuses. EFI fuse was blown. Replaced, blew immediately again, replaced, same thing. Got the truck home on a flatbed.
I did some research and assumed a ground in the fuel pump. I replaced the fuel pump, sending unit, fuel filter and pressure regulator. When I went to restart, the truck cranks but does not start. Seems the fuel pump is not getting power (0 volts across when key in any position). I wired the pump to the Lexus battery and it runs fine, so its not the pump. No EFI fuses are blowing now, and gas tank level works fine, but truck will not start. I even tried to start with fuel pump connected to lexus battery... no joy. I cranked it until the battery died and nothing. I charged the battery back and tried again... would not even turn over, no clicking, nothing. Let it sit overnight and it cranked in the morning, but would not start.
I traced the fuel pump wires (red and green and white and black) to the fuse block, and they are not getting voltage across them at any point downstream of the fuse block. However, measuring across the fuse location itself I get 12V on the EFI fuse fuse is good and I swapped it to verify). I also get 12V across "ignition", but only 6V across the "engine" fuse. The wiring is a bit of a mess under the dash as a previous owner installed a trailer wiring system (installed is used loosely) and an alarm system.
Does anyone have any idea what is going on? Why fuel pump is not getting any power and why engine will not start even with fuel pump powered externally? Why im seeing 6V across "engine"? And why this would happen suddenly? Also, EFI fuses are no longer blowing so I think I fixed that issue. So sorry for a long first post and I appreciate everyone's time.