I have a 2000 F150 4.2L V6. It is flooding all cylinders with fuel and filling up the crankcase. Has 35PSI fuel pressure at the rail. Has anyone had this issue? I don't know if this is a regulator issue or a sensor keeping the injectors wide open? Any advise would be appreciated!

 

How much is the crank case gaining fluid?....like sitting over night it is notably higher on the dip stick in the morning?


yes it could be a regulator issue. but I'm thinking if it was the regulator, the fuel pressure would probably read crazy high, 60-80psi or something like that.

Injectors rarely go south that bad...but

If you are suspecting the injectors. clean the injector area really well 1st & maybe get some new injector O-rings for when you go back together.

Then pull all the injectors, place clean rags below the injectors or zip tie freezer bags over the injectors ...remove the fuse for the ignition...then Key On, Engine Off (do not start/ turn over), this should prime the fuel system...note the pressure again...look at the now exposed injectors. Are they dripping or leaking?? (they shouldn't be). do the Key On, Engine off for a few times, rechecking the injectors & fuel pressure each time.

Key off... and let sit for a hour or 2....note again if the injectors are dripping or leaking.

If no leakage then it has to be sensor...prolly would suspect one of the coolant temperature sensors.

Or you have a very bad ignition issue...& If the fuel is washing down the cylinders super fast, you'll need to replace the spark plugs anyway, at the very least. SO while the spark plugs are out do a compression test, all cylinders...note all cylinder readings....re-run the compression test...but now put a little oil in each cylinder (1/4 teaspoon or so) before installing the compression gauge and retesting ...again note the pressure readings for each cylinder.

If during the compression test, you getting a reading like 0-20psi ...stop make sure the gauge is sealing...retest...if it continues to read low...stop...you have major mechanical issues.

 

Thank you for the reply. I noticed the crankcase higher after trying to start several times. I did run compression on most cyl and was ok. I was leaning toward the coolant sensor since it was ALL 6 cylinders flooding and the fuel pressure is 35PSI. I will post the results.