abuelito01

my 1973 mercedes w107 runs some minutes and then stops, i change injectors to fj118 alternatives before this ? anyone knows what is happenning, maybe this injectors are not good for this car ?

Plutoe

Well it's either fuel pressure or spark. Additionally and without the documentation, I would not get fancy with trying different parts---I'd go back to standard.

abuelito01

i check spark, and i have no problem with that, also fuel pressure, injectors are getting fuel but i dont know why stops after 10 minutes and then dont want to start

Plutoe

Yes you have fuel at the injector, however what was the fuel pressure before to the injectors---do you have a fuel pressure tester---what was is the pressure!

abuelito01

does this new alternative injectors maybe needs more voltage or an electronic start in the car ?

sneezix

I'd suspect the fuel filter, but you may have more luck if you posted in the correct forum.

bobterry99

Why? If it were the fuel filter don't you suppose the running of the engine would be affected during the ten minutes that it runs fine?

If you have spark, then I would check for a voltage signal to the fuel injectors. If you have that, then I would check to see if the fuel injection ECU is getting the timing signal from the trigger points located within the distributor. I have no schematic to explain how to do that.

No.

sneezix

Because it's built up enough fuel pressure to run for the first ten minutes, then has trouble keeping up, due to a bad filter.

bobterry99

There are two arguments against your case.

1. Pressure can only build if the fuel pump is running. The pump only runs for a second or two, and then the engine starts. If the bad fuel filter were incapable of passing sufficient fuel to run the engine indefinitely, then it could not possibly establish adequate pressure in just a second or two. And even if it could, fuel pressure would drop and kill the engine almost immediately after the engine started -- it would not take ten minutes.

2. The engine starts and ten minutes later it dies. If you are correct, then upon a restart attempt wouldn't the pressure build-up and allow the engine to run another ten minutes?