bad gas... quick fix

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Merrick
Posts: 26
Joined: Wed Mar 16, 2016 3:55 pm

bad gas... quick fix

Post by Merrick » Wed Apr 04, 2018 8:26 am

Hi all,

Last Sunday I was headed back down from Barnwell back to Houston and started to get some weirdness with the engine power in my 712. In short, it didn't feel smooth but I thought I was just getting buffeted by the gusty wind. Things got worse and power went lag-surge and then a thump, then some rapid lag-surges & thumps every 30 or 40 min... then every 15 or so only lag-surge-backfire. Backing RPM down to 3500 seemed to mitigate things for awhile but it returned after 30 minutes. So this was beyond annoyance but not quite ridiculous enough to stop and have the truck towed or trailered. So in some prior conversations with Andre, he had told me to try dumping in a pint of isopropyl alcohol in the tank if I thought there was a water condensation issue... or bad gas. So what the heck. I happened to have some 70% in my med kit and I thought I'd try it... though I really doubted the effect it would have on 15 or 20 gallons of gas... and I was wrong. The beneficial effect was almost immediate. The engine ran Much smoother with only a few rapid backfires over the next hour until we stopped at a Love's and I put 15 gal of 93 in it.

Leaving Barnwell I had filled up in Pittsburgh at an Exxon on medium grade gas, putting 15 gal in the 30 gal tank. It was an Exxon with a Subway in it, looked a bit mom & pop but seemed decent enough but I guess ya never know.

Needless to say, along with tools some PB blaster, WD 40 and a jump box I'll be adding a Costco two pack of isopropyl alcohol to my road kit.

thanks Andre, Merrick
712FAL 76 Austrian
710K 74 Austrian
712m's, 712K & 710K for sale and 718 projects with FF
300GSE 91 Swiss
1300L RW1 Unimog 86 German

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TechMOGogy
Canada
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Re: bad gas... quick fix

Post by TechMOGogy » Wed Apr 04, 2018 8:58 am

Good tip to know!
Thx
72 Pathfinder | 75 710M 2.7i | 96 350GDT Worker

pinzinator
Posts: 820
Joined: Thu Jul 29, 2004 3:12 pm
Location: Indio, California

Re: bad gas... quick fix

Post by pinzinator » Wed Apr 04, 2018 12:51 pm

Every year I run my Pinz as low on gas that I can, then drain the tank. I waste a gallon of gas but have never had a fuel issue in 15 years.

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VinceAtReal4x4s
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Re: bad gas... quick fix

Post by VinceAtReal4x4s » Wed Apr 04, 2018 4:05 pm

Why did you put 93 in it?
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Jimm391730
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Location: Idyllwild, CA

Re: bad gas... quick fix

Post by Jimm391730 » Wed Apr 04, 2018 4:24 pm

While 70% Isopropyl can absorb moisture, the remaining 30% IS water. You would be better off with 100% alcohol from a paint or hardware store for storing in case of future need. Also, "HEET" which is usually available in auto parts stores (especially in the colder climates) is something like 99% methanol, and is already packaged and sealed for storage.
Jim M.
712W and 710M

Merrick
Posts: 26
Joined: Wed Mar 16, 2016 3:55 pm

Re: bad gas... quick fix

Post by Merrick » Wed Apr 04, 2018 6:49 pm

70% is what I had on hand. I planned to carry 90% but will look for the HEET- thanks, m
712FAL 76 Austrian
710K 74 Austrian
712m's, 712K & 710K for sale and 718 projects with FF
300GSE 91 Swiss
1300L RW1 Unimog 86 German

EmbarkChief
United States of America
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Joined: Wed Aug 28, 2013 12:47 pm
Location: Houston, Texas

Re: bad gas... quick fix

Post by EmbarkChief » Wed Apr 04, 2018 8:41 pm

Glad everything worked out. Just out of curiosity, how long do that trip take?


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63rover
Canada
Posts: 237
Joined: Thu Oct 10, 2013 8:18 pm
Location: Mt. Hope, Ont., Canada

Re: bad gas... quick fix

Post by 63rover » Thu Apr 05, 2018 4:58 pm

The cheapest solution I have found is Methyl Hydrate from the paint department. It is what gas-line antifreeze is. A gallon costs about the same as a small 1 cup g-l antifreeze bottle.

Merrick
Posts: 26
Joined: Wed Mar 16, 2016 3:55 pm

Re: bad gas... quick fix

Post by Merrick » Thu Apr 05, 2018 5:30 pm

I actually went up to get Andre to check on a few things up in Mount Pleasant first- the trip between Houston and there was about 240 miles... with stops and running about 55 to 60 mph the trip took a bit more than 5 hours with stops. Peddle to the metal the 712 slowed to ~45 going up some of the steep hills around Gladewater.

Houston to Barnwell would have been ~210miles.
712FAL 76 Austrian
710K 74 Austrian
712m's, 712K & 710K for sale and 718 projects with FF
300GSE 91 Swiss
1300L RW1 Unimog 86 German

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