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Do you put diesel in a gas truck?

Discussion in 'Performance & Fuel' started by rileyjr16, Sep 16, 2013.

  1. rileyjr16

    rileyjr16 Rockstar 3 Years 1000 Posts

    Alright so we all know that they have products like seafoam and Lucas to clean out our fuel injectors. Whenever I was little I always remembered my dad (very smart with vehicles) putting maybe a gallon and a half to 2 gallons of diesel fuel in his 1992 GMC Sierra with the 4.3 V6. He always told me that this was one of the best ways to help clean out your engine and keep the system clean. I'm just curious if anybody ever runs diesel occasionally through their trucks mixed with gasoline. I only do this every now and then and since I have a fuel injected engine instead of TBI, I don't quite have the ratio that my dad used to use. I just filled up 23.178 gallons of gasoline and about 3/4 gallon of diesel fuel.

    What can this hurt?
  2. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Never ran diesel with the fuel but some additives do have a chemical make-up similiar to Diesel.
    Possible consequences might be an oily coating in the cat convertor, but it should burn out quick with the temps, and oily residue on pre cat sensors.
    But on the other hand it should offer lubrication to valve seals, seats, and injectors.
  3. rileyjr16

    rileyjr16 Rockstar 3 Years 1000 Posts

    That was also another bonus I remember hearing about. Lube.
  4. reggiecab2000

    reggiecab2000 Rockstar 4 Years 500 Posts

    what generation is your father from?
    sounds just like mine lol
    My dad has always told me the same thing!
    but i have yet to try it...
  5. rileyjr16

    rileyjr16 Rockstar 3 Years 1000 Posts

    The Dwight D Eisenhower generation.
  6. yotchie

    yotchie Rockstar 100 Posts

    i have heard of the diesel fuel. I think the amount seems a bit high but if the results are positive then all the power to ya. i have also heard a small amount of atf fluid is good for injectors but i haven't tried it
    Last edited: Sep 16, 2013
  7. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Ive used ATF fluid in a carburated engine to loosen stuck lifters.
    It also works well in Mazda RX7 rotary engines to condition the wipers on the rotor, stops excessive oil burn.
  8. rileyjr16

    rileyjr16 Rockstar 3 Years 1000 Posts

    So not recommended for use in my truck (ATF)
  9. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    Back in the day ATF was ok. But, I have heard that it can mess up your cats and O2 sensors. I don't know if it is true or not. I run TC-W3 2 cycle marine formula in every tank with a 5 gallon to 1 ounce ratio. It is said that it lubes and cleans injectors, fuel pump, and valves. I have been running it approx 6 months and have seen an increase from between 13.5-15.2 mpg to a solid and consistent 17.4 mpg in the city. Not to mention a smoother idle
  10. rileyjr16

    rileyjr16 Rockstar 3 Years 1000 Posts

    Heck I need me some of that

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