Several years ago when the LCI cans were even cheaper than they are now I did some experimentation with using them for fuel. Here is what i posted back in 2010.
"i've got both the Scepter and the LCI cans and they are very close. Finish on the LCI cans isn't as nice as the Scepter, but they seem to be the same thickness plastic (based on wt.). My scepter has an oring on the air breather knob where the LCI didn't. It cost me a whole quarter each to retrofit some viton orings on to the 7 LCI cans I have. In the end the LCI cans have performed just as well as the Scepter water cans. I also posted the following in another thread comparing the LCI water cans to Scepter fuel cans.
"I explored this pretty indepthly a year or two ago. MY goal was to use the buylci.com water cans for fuel. They are very very close to the Scepter water cans. I ended up deciding not to do it. I researched out the military spec for the scepter fuel cans and recreated the testing on the LCI cans. Not using the same MFC spout... wasn't a big deal as i was going to use a super siphon. Putting viton orings on the vent and hose bib was simple and sucessful.
The problem came on the main lid seal. As Kurt said, the water can only has a 1/8" lip instead or the 5/8" flat ribbed seal surface. The water can uses a traditional "wedge" to seal within the cap. You see this being used on regular old gas cans from home depot. One of the reasons you don't want to use regular old cans is because this seal does not work when bouncing around and when the can changes temp. I attempted to install a large viton oring into this sealing area with very little success. I'd have to look up the military spec, but the can had to hold liquid under a certian pressure for a certian amount of time. I could not get it to meet either requirement. I could take it to about half the pressure required but could never get it to hold it for the time needed.
I was not too worried about the material or the plastic thickness. The LCI cans are made out of a single material, High Density Poly Ethylene(HDPE). From my discussions with LCI and tearing apart a can, there was no lining. The water cans are also a little thinner walled than the fuel cans. This also was not too much of a concern for me as the regular cans from Home depot are much thinner than the water cans. When doing the pressure test (I did it succcessfully on a Scepter MFC) the LCI can did swell more than the MFC, but not by much. I was only looking to use them for fuel storage in my garage so the heat and bouncing wasn't a big deal. I still opted to not use them at this point. Could you use them for emergencies, yes. They might be better than a regular plastic gas can, but probably not worth the risk. "
