Dekkbrenneren

Hi again

Was on my way to work, It worked perfectly.

Then a couple off hours later i needed to go out, but it Will only crank, no sign of life. But ignites with start gas but still no fuel. What can this be?

The tank, pump and filter is new. Maybe a fuse? Witch one?

Thanks 😊

Irish_alley

could be something wrong with the distributor and sending signal for the injectors to "fire". since it doesnt stay running that kind of eliminates the fuel pump relay and O.P.S.. but it doesnt eliminate the pump. need to see if your injectors are firing and if it has any fuel pressure

Dekkbrenneren

Think It's the pump, or something wiith the signal to the pump from ECU. Figurerd out the pump are not getting ground when the ECU say so, or should say so. Or the relay? Can also be oil pressure sensor,
How many ohm should the sensor have??

Something funny here as the fuel gauge suddenly shows full tank and oil pressure at max when its not running 🤔

Dekkbrenneren

Injector works, have spark but no fuel pressure.

Is there any commond failures? The pump and filter are almost new. What can cause the pump are not getting ground?

Irish_alley

one common failure is the rubber fuel line in the tank that connects the fuel pump to sending unit can crack and leak but that normally only causes poor pressure and leads to a misfire. where did you check pressure from, and can you hear the fuel pump "prime" when you first turn the key on? might need to take the fuel tank cap off and listen

Dekkbrenneren

Thanks for tip

I did not check pressure cause i now there is not
The injectors works fine, have power and pulse. Tested them also with 9v battery. I found the pump wires in the back, took the multimeter on them, and when i turn on the ignition i got power too the pump for a millisecond and It's gone.

Why is like that?

Can it be oil pressure sensor maybe? How many ohm should it have? And also the fuel gauge suddenly shows full tank.

Im start thinking fixit the redneck way, wire the pump directly too the battery. At least i could drive it home from work and get 1 happy boss 😂

Sorry bad english writing

All reagards

Guy from Norway

Irish_alley

not sure why it only powers for a split second. if its like the full size trucks it should power up for at least 3 seconds. the fuel gauge might be from a poor connection or broken wire. if i was to wire up something like this i would wire it to a power source thats only hot when the key is in the "on" position. that way you can just turn it off if you need to. but if you do it that way you need to use a relay of or sort or another due to amp draw

Dekkbrenneren

Thanks

I drive out today too get the car home, I tried to start it 1 last time before i tried this redneck tricks and IT fired up like nothing ever happend.

So i think this maybe a bad soldering in the ECU (or somewere else) or bad ground somewere. Also maybe condensaition.

Rednucleus

If it's like my 93 5.7 I would change the ICM in the distributor (if there is one)- I am on my 3rd one; usually fail w/o warning and your description fits what happens when it fails - and when it cools down it can start working again, then fail again later

Dekkbrenneren

Okay thanks 👍😎