my son has a 1985 mustang lx v6 and he is using alot of fuel after replacing the fuel pump and filter we have put a new map sensor knock senser o2 sensor fuel presure regulater and still using alot of fuel what else can be wrong the spark plugs are black and he leaves black marks when he leaves from the exhaust
Country: United StatesMake: FordModel: MustangYear: 1985Engine: 3.8
Thanks for your question. Sorry you're having car problems, I will do my best to research this and supply you with an accurate answer ASAP. If this just happened right after the pump replacement, then it may be the wrong pump and it delivers too much pressure. Hope this helps you. Thanks, Ron
its the same fuel pump we took off the car
Ok, then check for restrictions in the return line, that's the only thing that could increase the pressure if that's what's happening. What pressure reading are you showing right now? Ron
i really dont know
Should be 37-42, we need to check that with a gage, there's a fitting it scerws onto rgith on top of the throttle body.
Check also for a vacuum leak at the hose going to the MAP sensor.
i only know the car smells like gas when running and hes getting 176 miles on 80.00 in fuel there isn't any leaks
he said his fuel injects are letting out air instead of fuel
That would mean the car doesn't run, but it does. How is he monitoring air? It seems to me that the pump installation was done wrong. This all started after replacing it, so it has to be related.
when we replaced the fuel pump in the tank the little end peices that hook on to the fuel pump from the sending unit just crumbed off so my husband replaced them with new ends could that be the problem
It sure can, this needs to be re-done. That's why the pressure is too high. Thanks, Ron
Please check all the items I mentioned that you haven't tried yet and let me know the results. Please click on the accept button for me now, and if you have any more questions afterwards, just keep this link and ask me. Thanks again, Ron
so do we need to buy a new sending unit
Most likely, those can't be successfully repaired.
ok we will try that
Very good, don't forget to accept for me too:) Ron
You bet, thank you too. Ron
37 years experience