Hello Everyone,
My name is Patrick. I live in Snohomish, Washington (pronounced Snow-Home-Ish). I have owned this Jeep before I even had a license. My grandfather bought it new.
The Basics:
1993 YJ 2.5L with 95K miles
My Actions Prior To The Issue:
- Changed the oil & filter
- Cleaned the fuel tank thoroughly
- Replaced the fuel pump & filter/ regulator in the fall of 2020
- Replaced spark plugs & cables
- Replaced the serpentine belt
- Replaced the coolant, thermostat, gasket, coolant lines, and flushed the heater core (not in that order)
The Issue:
Oil in the fuel tank, which caused the new fuel pump to quit. I DID NOT put engine oil in my fuel tank.
Other Information:
The Jeep was running very rough after replacing the fuel pump (and the items listed above). Loping and struggling to run smoothly. My suspicion was the fuel injectors were bad. The Jeep had not been running for nearly 5 years, so I replaced everything other than the injectors (hoping they were okay since I didn't see any build-up on them when removed). When I decided to replace the injectors I wanted to drop the tank again since the fuel pump was no longer functioning (still had power to the unit), remove the old pump assembly, and make sure I hadn't broken any wires or accidentally grounded the unit artificially.
Once I dropped the tank and removed the assembly I noticed a dark sheen on the fuel level indictor. I removed some fuel from the tank and instantly recognized the abundance of oil within the fuel. I have never seen oil get into a fuel tank before, and am not sure what caused the issue. The tank was cleaned prior to this, and new fuel was used (approximately 3 gallons). There was nothing in the tank to cause this prior to me re-installing the tank the first time.
My Questions:
1. Has anyone seen this before?
2. What causes this?
3. Is there a solution, or am I looking at major investments?
4. If you suspect this isn't engine oil in the fuel, then what could it be?
I can provide photos of the oil in the fuel, but I assume the more seasoned mechanics have encountered oil in fuel before.
Thank You!
Patrick
My name is Patrick. I live in Snohomish, Washington (pronounced Snow-Home-Ish). I have owned this Jeep before I even had a license. My grandfather bought it new.
The Basics:
1993 YJ 2.5L with 95K miles
My Actions Prior To The Issue:
- Changed the oil & filter
- Cleaned the fuel tank thoroughly
- Replaced the fuel pump & filter/ regulator in the fall of 2020
- Replaced spark plugs & cables
- Replaced the serpentine belt
- Replaced the coolant, thermostat, gasket, coolant lines, and flushed the heater core (not in that order)
The Issue:
Oil in the fuel tank, which caused the new fuel pump to quit. I DID NOT put engine oil in my fuel tank.
Other Information:
The Jeep was running very rough after replacing the fuel pump (and the items listed above). Loping and struggling to run smoothly. My suspicion was the fuel injectors were bad. The Jeep had not been running for nearly 5 years, so I replaced everything other than the injectors (hoping they were okay since I didn't see any build-up on them when removed). When I decided to replace the injectors I wanted to drop the tank again since the fuel pump was no longer functioning (still had power to the unit), remove the old pump assembly, and make sure I hadn't broken any wires or accidentally grounded the unit artificially.
Once I dropped the tank and removed the assembly I noticed a dark sheen on the fuel level indictor. I removed some fuel from the tank and instantly recognized the abundance of oil within the fuel. I have never seen oil get into a fuel tank before, and am not sure what caused the issue. The tank was cleaned prior to this, and new fuel was used (approximately 3 gallons). There was nothing in the tank to cause this prior to me re-installing the tank the first time.
My Questions:
1. Has anyone seen this before?
2. What causes this?
3. Is there a solution, or am I looking at major investments?
4. If you suspect this isn't engine oil in the fuel, then what could it be?
I can provide photos of the oil in the fuel, but I assume the more seasoned mechanics have encountered oil in fuel before.
Thank You!
Patrick