67 ford f100 oil in fuel filter. And not running unless gas is poured in carb


Asked by Dec 30, 2012 at 06:52 PM about the 1967 Ford F-100

Question type: Maintenance & Repair

6 Answers


Assuming you still have the OEM style mechanical fuel pump. I'd say the rubber diaphragm inside the pump has split allowing oil, from the crankcase, to be sucked in with the fuel. HTH. -Jim

1 of 1 people found this helpful.
Best Answer

I do have the oem style. Could this cause truck to not running? Thanks jim This is the most help i have gotten so far.

1 of 1 people found this helpful.

You're welcome. Yes it can prevent it from running. That diaphragm creates the pumping action which supplies fuel to the carberuator. To test the fuel pump, disconnect the fuel line at the carb. Get a metal or glass cup or jar. Hold the disconnected fuel line in the container while a helper cranks the engine. Gas should shoot out in bursts as the engine is cranked. I'm betting you get little or no fuel. Then go ahead & replace the fuel pump. Change your oil too as fuel may have leaked into the crankcase as well. HTH. -Jim


Will keep u posted thanks again. Im sure i will have alot of questions


You have oil in the filter because there is a tube going to the valve cover. That's the positive crankcase ventilation for the engine. The fumes come up and condense leaving the oily residue. The 67 Fords have a carburetor and sometimes the fuel in the bowl leaks down into the intake when parked. It takes a bunch of cranks to refill the bowl before it fires. Check out the pump as mentioned and add a clear/translucent fuel filter up stream so you can see what's going on in the future. I had a 79 Jeep like that. I ran a piece of aquarium tubing into the cabin and would squirt a little starting fluid into the carb to reduce the drain on the battery. It would fire, spin the engine enough to pump the fuel into the bowl. Just needed when the truck sat a few days.

1 of 1 people found this helpful.

Ok Mike, you're welcome. Happy to help. -Jim

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

  • 67 ford f100 oil in fuel filter. And not running unless gas is poured in carb 6 answers

    1967 Ford F-100


    Maintenance & Repair

  • Gas in the oil 4 answers

    Have 79 f100 with a 302. I just put a new Holley manuel choke carb on it but its the 3rd carb from the parts store and the truck is still having a hard time starting. When it does its not idling ...

    1979 Ford F-100


    Maintenance & Repair

  • bleed an injected petrol fuel line in '85 f100 1 answer

    I have just replaced a selector valve in my '85 f100 and now need to bleed the fuel lines, what is the best way?

    1985 Ford F-100


    Maintenance & Repair

  • 1970 Ford F100 not getting fuel 3 answers

    My 1970 Ford F100 isn't getting fuel. Replaced the carb and it will run for a good few miles then bog out and die. Plenty of gas in it too. Ideas?

    1970 Ford F-100


    Maintenance & Repair

  • f100 stalls in gear 15 answers

    i have an 82 f100 4.9 300 she has vacuum leaks but in idle runs great timing was set to 10 degrees and carb was rebuilt and cleaned by a local carb shop but the truck itself has trouble starting runs ...

    1982 Ford F-100


    Maintenance & Repair


Looking for a Used F-100 in your area?

CarGurus has 168 nationwide F-100 listings and the tools to find you a great deal.


Search Ford F-100 Questions

Ford F-100 Experts

#1 tennisshoes
Reputation 460
#2 MrBlueOval
Reputation 310
#3 Rowefast
Reputation 280
View All

Related Models For Sale

Used Ford Mustang
724 Great Deals out of 44,318 listings starting at $1,500
Used Ford F-250
475 listings starting at $1,295
Used Ford Bronco
196 listings
Used Chevrolet Corvette
231 Great Deals out of 22,295 listings starting at $3,750
Used Chevrolet Camaro
367 Great Deals out of 31,402 listings starting at $2,400

Used Cars For Sale

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.