98EdBomber
Well-Known Member
- Joined
- January 5, 2011
- Messages
- 204
- Reaction score
- 5
- City, State
- Las Vegas, NV
- Year, Model & Trim Level
- 98 E.Bauer 4.0(RWD)
NO Check engine Light. No stored codes. I do my own work on this vehicle.
192K miles. Replaced fuel pump maybe 6 years ago FYI. Cant remember brand I think Airtex or whatever. Had this truck since it was new. Looking to sell and need to fix this long crank issue first.
98 4.0 sohc losing fuel pressure after sitting for hours. Long crank when cold sitting over night. Have to cycle key few times to build pressure. Starts right up after warm. Im assuming I either have a fuel pressure regulator problem or a leaky injector.
I pulled all 3 plugs on the driver side and they looked a little carboned but not wet.
How do I isolate this issue without pulling the injectors? Can I bypass the fuel flow to the regulator (pump) assuming its in the gas tank and if I then have fuel pressure maintained I can assume the fuel injectors are not the problem?
Is there only one feed from tank to fuel rail since it is "returnless" or does this engine have a return line as well. If no return line then how could i isolate the injectors to see if fuel pressure is maintained?
Fuel pressure stays at 30 when running in idle. So I think the actual pump is fine.
I smelled the oil on the dipstick and i really cant say it smells like fuel.
The leak is slow. Its possible an injector is dripping slowly?
Is there a way to pinch off the return line or does this not have one? I want to isolate the injectors and see if they are leaking.
Or is there another easier way without an expensive scan tool.
192K miles. Replaced fuel pump maybe 6 years ago FYI. Cant remember brand I think Airtex or whatever. Had this truck since it was new. Looking to sell and need to fix this long crank issue first.
98 4.0 sohc losing fuel pressure after sitting for hours. Long crank when cold sitting over night. Have to cycle key few times to build pressure. Starts right up after warm. Im assuming I either have a fuel pressure regulator problem or a leaky injector.
I pulled all 3 plugs on the driver side and they looked a little carboned but not wet.
How do I isolate this issue without pulling the injectors? Can I bypass the fuel flow to the regulator (pump) assuming its in the gas tank and if I then have fuel pressure maintained I can assume the fuel injectors are not the problem?
Is there only one feed from tank to fuel rail since it is "returnless" or does this engine have a return line as well. If no return line then how could i isolate the injectors to see if fuel pressure is maintained?
Fuel pressure stays at 30 when running in idle. So I think the actual pump is fine.
I smelled the oil on the dipstick and i really cant say it smells like fuel.
The leak is slow. Its possible an injector is dripping slowly?
Is there a way to pinch off the return line or does this not have one? I want to isolate the injectors and see if they are leaking.
Or is there another easier way without an expensive scan tool.