gas accidentally put in tank - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 04-07-2011, 04:19 PM   #1 (permalink)
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Angry gas accidentally put in tank

Ok so my wife was running on the "low fuel light " in our excursion and stopped at a unfamilar station just to get enough diesel to get to our regular station,anyway she grabs the green hose begins to put in about 6 gallons of fuel before she realizes it is gas. She calls me and I called a diesel mech and he said since it has a 44 gallon tank to top it off and it should be ok with a fuel ratio of 85/15 diesel/fuel and should be ok to mix a be ran thru the engine. This was 6 months ago and she has noticed when she gets down a little below the 1/4 tank level it acts up at stop lights then level outs once she has picked up speed (kinda like a CPS starting to go out) then once the tank is filled back up it runs great up until a little below the 1/4 tank ind. So my question is, does diesel and gas not really mix like the mechanic and I were thinking and I need to get it sucked out or is there something else I need to look for? Oh by the way she did take me by the place she was at and they have 1 gas hose out of 4 that is green.
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Old 04-07-2011, 05:05 PM   #2 (permalink)
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What it may have done, is the gas cleaned up some of the deposits that diesel fuel leave behind. These then have clogged the inlet screen at the bottom of the pickup. There is a bypass above the screen that opens up and allows fuel in if the screen get's plugged. This is what it sounds like to me. Problem is, you have to drop the tank to get to it. Being an EX, you don't even have the option to pull the bed instead.
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Old 04-07-2011, 05:05 PM   #3 (permalink)
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The gas and diesel will mix very easily, and since it was 6 months ago that the 6 gallons of gas was put in, I doubt you could tell without a spectrographic analysis of the fuel whether there was even a trace of gas left in the tank.

Your problem is more likely that the fuel tank pickup is sucking air thru the auxiliary inlet on the foot that gets exposed at about 1/4 tank. Air getting into the injectors will cause it to stumble till it gets worked thru the system. It's probably time to do the Hutch Mod, which entails modifying the fuel pickup foot and getting rid of the quick connects on the fuel lines between the tank and the fuel pump suction. Here's a link to a kit to take care of that: Driven Diesel 7.3L Fuel Tank / Pre-Pump Kit
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Old 04-07-2011, 05:27 PM   #4 (permalink)
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I do a gallon of gas in a tank once a month (1qt of transmission fluid every fillup). That's how my ole 96 has been done and it has 650k on factory injectors. Only problem with it, is it is addicted to starting fluid. I know I have mentioned at least 2 "no-nos" by expert standards but the mileage speaks for itself.

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