Anyone know how engine oil would be leaking by the air and fuel lines going into the fuel tank?

20

Asked by Jan 29, 2014 at 08:09 PM about the 1998 Ford F-150 XLT Extended Cab SB

Question type: Maintenance & Repair

1998 Ford F-150.  There are absolutely no leaks in the engine compartment and the
underside of the engine is absolutely leak free.  However, there is oil literally dripping from
the frame right by the fuel inlet to the tank.  The frame in front of and behind this location
is bone dry.  How can oil from the engine get there?  The bottom of the gas tank and the
surrounding area is covered in engine oil

17 Answers

122,765

Sure its oil and not brake fluid?

1 people found this helpful.
22,155

Or gasoline?

116,235

How about transmission fluid, output shaft seal leaking, driveline slinging it as you go down the road, or if rear fuel tank pinion seal leaking.

1 people found this helpful.
27,975

I think you may be on to something with a Pinion Seal. Those 8.8" rear ends go through a lot of Axle seals and Bearings too. Is the Backing plate or inside of the wheel wet with oil too? If so, axle seal, bearing or axle has failed.

20

Absolutely positive it is not brake fluid, gasoline or gear oil, etc. It is engine oil. The pinion seal is not leaking, the differential is not leaking, axle seals are not leaking everything is dry in front of the gas tank and behind it. Back plates and wheel wells are dry too. Nothing is being slung. I know it sounds like I don't know what I am talking about, but I do. I am very knowledgeable about vehicles, build my own engines, have a race car and have worked on cars for the past 35 years. But this one has me stumped. This is oil. I am loosing about 2 quarts of oil every 1000 miles. The engine compartment is bone dry. Value covers don't leak, rear main doesn't leak, oil pan doesn't leak...everything under the engine is dry like a new car.

1 people found this helpful.
22,155

Is there any way something spilled in the bed or got under the bed liner?

1 people found this helpful.
122,765

Lol. I was thinking the same thing. Sure can't seem to wrap my head around what William has going on with his truck.

22,155

That's the only way I could think oil would get there dandy.

21,905

there is nothing there that would hold engine oil or have it passing by. It's either something else or its getting slung there from a much worse leak, but that would be noticable in other locations.

20

Appreciate all the suggestions but still no help. Nothing spilled in the bed, not getting slung, etc. I have been loosing about 2 quarts of engine oil about every 1200 miles and have not been able to determine why until I found this leak. Motor isn't leaking, isn't burning oil, nothing. I'm just wondering if there is any way that something in the engine breathing systems are blocked and backing up and sending the oil through the vent lines that go to the gas tank that maintain air pressure in the tank. I've checked the PVC and it is clear. I used to think I was a relatively smart guy when it came to figuring out problems, but this one has me stumped.

22,155

Some of these were known to leak oil at the back of the head from the head gasket on the engine and run down but you should be able to see or smell it. How many miles are on it?

20

There are no leaks on the engine anywhere. It is totally dry everywhere. Has about 180K

1 people found this helpful.
122,765

But if you having to add 2 quarts every 1200 miles it's either burning it or there is a leak somewhere. Keep us informed on what you find.

20

Agree, and it's not burning oil. No smoke, no smell, nothing. Although it sounds inpossible, the leak is back by the gas tank and I have yet to determine why.

122,765

Any luck figuring it out William?

20

Not yet

Did u ever find the problem leak or burning I go with burning 2 quarts is to much to leak without a sign. Let us know thanks

Your Answer:

F-150

Looking for a Used F-150 in your area?

CarGurus has 208,288 nationwide F-150 listings starting at $998.

ZIP:

Ford F-150 Experts

  • #1
    OJ
    Reputation
    10,510
  • #2
    dandyoun
    Reputation
    4,890
  • #3
    tennisshoes
    Reputation
    3,820
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,788 Great Deals out of 154,391 listings starting at $1,000
Used GMC Sierra 1500
746 Great Deals out of 61,254 listings starting at $1,395
Used Ford F-250 Super Duty
487 Great Deals out of 40,156 listings starting at $2,700
Used Dodge Ram 1500
326 Great Deals out of 9,355 listings starting at $1,995
Used Toyota Tacoma
422 Great Deals out of 48,089 listings starting at $2,994
Used Ford Mustang
260 Great Deals out of 37,871 listings starting at $1,350
Used Ford F-250
396 listings starting at $4,995
Used Ford F-350 Super Duty
349 Great Deals out of 23,248 listings starting at $3,249
Used Ford Explorer
862 Great Deals out of 67,771 listings starting at $800
Used Chevrolet Tahoe
547 Great Deals out of 38,191 listings starting at $1,243

Used Cars For Sale

2018 Ford F-150 For Sale
112 Great Deals out of 133,822 listings starting at $18,956
2017 Ford F-150 For Sale
124 Great Deals out of 8,757 listings starting at $18,160
2016 Ford F-150 For Sale
243 Great Deals out of 9,167 listings starting at $14,800
2015 Ford F-150 For Sale
296 Great Deals out of 11,035 listings starting at $12,999
2014 Ford F-150 For Sale
360 Great Deals out of 10,629 listings starting at $7,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.