What caused gasoline to gum up

Asked by Tonymisfire Dec 10, 2017 at 09:39 AM about the 2007 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

My jeep was having misfire problems. First I
changed all the plugs d ur to that being the
cheapest route. That didn't work. Then eventually
the jeep didn't start. Just turn over but wouldn't
start. So I figured pump. So I ordere a new fuel
pump and as I dumped all the old gas from the
thank I found a big thing of brown slime/sludge. It
was also in the bottom of my fuel pump clogging
the first filter. I put the new pump in with fresh gas
and the jeep started but is still reading multiple
misfires. I'm thinking that sludge made it to the
injectors??? Any ideas on what has caused this
sludge. Note my car had  pump issues 3 month
before with ponly 86k on it. That had white slime in
the tank.

3 Answers
45,255

jamnblues answered 7 years ago

my guess is that the modern gas is different because of the ethanol in it- I have not researched this, so I may be wrong, but common wisdom has it that you can not let a car sit with modern gas in it- you don't say if your car sat for any length of time, but I'm wondering if leaving gas in a tank and always keeping it full could form sludge? I have never thought of this- anyway, it is common for cars that sit, old cars with modern gas in the tank, to need a gas tank cleaning BEFORE it is started for the first time- if started with the sludge, it will make its way to the carb, or worse, to the injectors, and coat the entire fuel system with "sludge" idk- you have SEEN the stuff, and you have described it pretty well here, what do you think?

Mark helpful

Tonymisfire answered 7 years ago

The vehicle hasn't sat for than a week since we have bought it. Lately the longest it sat was 2 or 3 days. I just hoping it didn't do anymore damage. And I'm hoping no one us messing with me. After I found this I purchased locking gas caps for my vehicles.

Mark helpful
40,075

beatupchevy answered 7 years ago

locking gas cap is a good idea because I was going to ask if it may have been tampered with , I don't think the vehicle is that old for that much crap to be in the tank

Mark helpful

Your Answer:

Related Questions

  • What caused gasoline to gum up 3 Answers

    My jeep was having misfire problems. First I changed all the plugs d ur to that being the cheapest route. That didn't work. Then eventually the jeep didn't start. Just turn over but wouldn't start...

    2007 Jeep Grand Cherokee Limited 4WD

    -

    Maintenance & Repair

  • What years interchange from 90 what to 90 what 4 Answers

    What years enter swap with a 95 Jeep Grand Cherokee Laredo as far as getting replacement head bolts

    1995 Jeep Grand Cherokee Laredo 4WD

    -

    Maintenance & Repair

  • What would cause my freon to go low after my radiator fan going out asi from a leak? 1 Answer

    A/c was in good working condition. Recently my radiator fan relay went out. After i repaired it the a/c was not working any longer. It turned out that the freon had hit a low level which caused the ...

    2002 Jeep Grand Cherokee Laredo

    -

    Maintenance & Repair

  • Why can’t Jeep just fix what they messed up?? 1 Answer

    I also am having this problem with my ‘02 Jeep GC Laredo 4.0 strait 6, it seems like Jeep would have let us know the problem by now, but I guess not... What it seems I know from reading the miles ...

    2002 Jeep Grand Cherokee Laredo 4WD

    -

    Maintenance & Repair

  • No electrical power getting to the tow wiring hook up 2 Answers

    I hook up a tow package and the wiring harness does not seem to be generating a power. The trailer lights are not working. I tested the harness feed from teh Jeep and I am not getting a power. Does it...

    2015 Jeep Grand Cherokee Altitude 4WD

    -

    Maintenance & Repair

Grand Cherokee

Looking for a Used Grand Cherokee in your area?

CarGurus has 3,187 nationwide Grand Cherokee listings starting at $4,444.

Postal Code:

Shortcuts

Search Jeep Grand Cherokee Questions

CarGurus Experts

  • #1
    Hornet_2497
    Reputation
    8,970
  • #2
    Gene Arnett
    Reputation
    7,010
  • #3
    thejeepdoctor
    Reputation
    6,580
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Dodge Charger
34 Great Deals out of 738 listings starting at $3,400
Used Dodge Durango
58 Great Deals out of 2,246 listings starting at $5,500
Used Dodge Challenger
26 Great Deals out of 475 listings starting at $7,999
Used Jeep Wrangler
146 Great Deals out of 5,015 listings starting at $4,500
Used Ford F-150
310 Great Deals out of 14,102 listings starting at $1,712
Used Ford Explorer
74 Great Deals out of 2,062 listings starting at $3,995
Used Toyota 4Runner
12 Great Deals out of 299 listings starting at $9,995
Used Chevrolet Tahoe
12 Great Deals out of 886 listings starting at $12,900
Used Chevrolet Silverado 1500
204 Great Deals out of 5,868 listings starting at $2,975
Used Chrysler 300
34 Great Deals out of 553 listings starting at $3,999

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. Content will be removed if CarGurus becomes aware that it violates our policies.