E10 vs Recreational(no alcohol) fuel

[cdavisdb]

i've been a confirmed Recreational fuel user for years, hate the very idea of Ethanol, but Recreational fuel, as currently available, looks like a poor option.

After experiencing what sure looked like phase separated water/alcohol corrosion damage in both my boat engines at the same time, I've done a bit of research. Turns out the "non alcohol" gas I buy at the filing station is VERY often contaminated with ethanol, and not necessarily a small amount. This left me extremely vulnerable to phase separation, much more so that when using E10. 10 micron Racors will stop water and phase separated alcohol water mixes unless too much gets in the filter, then it passes right through and may leave little or no evidence of its passage(until the engine quits). Also discovered that switching back and forth from E10 to recreational fuel is much more likely to create phase separation than sticking with one or the other.

I'm stuck with recreational fuel because I buy so much fuel in the Bahamas, but if I was staying in the US, I'd switch to E10 and take the necessary precautions. Hardly a good option,but better than anything else available. I plan to develop a separate fuel source for my kicker(done), check my Racors several times each trip, refuel after every trip, change filters at least once a year, and look for a good way to test for ethanol contamination in the fuel I buy. Any suggestions on a source?

Can I shoot the ass who came up with the idea of ethanol??

My thanks to Bushwacker and the E-tec forum for helping me develop the above information.

[DonV]

"Can I shoot the ass who came up with the idea of ethanol??"

Please do, however it will take a lot of ammo to get all of them!!!!

[pelican]

every time I read these rants,i laugh ! and I mean EVERY time !

find the source of the water entering your tank - that WILL solve the phase separation problem

water entering the tank,this causes phase seperation

[FLexpat]

I have often wondered why I have not seen a desiccant tube in the vent line - something like a drierite or molecular sieve filled tube - we use them a lot for air drying in other applications and it seems like it would be an easy and passive solution for water coming in with air through the vent line. Any answers?

[pelican]

desiccant bag would cause a restriction,in the vent line...

[Bushwacker]

Originally Posted by cdavisdb

. . .My thanks to Bushwacker and the E-tec forum for helping me develop the above information.

Conner sent me a note a couple days ago about a temporary problem he'd had with both his main and kicker engine. Here's the reply I sent him along with the relevant links to the E-TEC Forum, which is an excellent forum BTW, much like CSC, with support from a number of very knowledgeable BRP techs:

Here is some background info on some of the characters in the discussions in attached links to give you a feel for their credibility: LourPitcher is a retired NASA engineer and electronics expert in Texas that runs a 75 mph bass boat and comes from a family in the oil/gas business; Steelhead is a private pilot in Alaska and may be a petroleum engineer. Seahorse is a very savvy BRP tech rep. Evinrude/Joe is the owner of the website, dealer Barnacle Bill in NJ. Huey is a dealer/tech in Australia that's been selling all brands of outboards for 40+ years, and seems to be very knowledgeable. Olypopper is another very experienced dealer/technician in Alaska. jimh is an electrical engineer in Michigan that tends to over-analyze everything, but occasionally comes up with some good info.

1. This thread was started by a guy with a 250 on a bass boat that blew a hole in a piston, evidently due to detonation, either from bad low octane phase separated fuel or lean combustion/restricted fuel flow. The relevant discussion begins with post #40 on P3. Very interesting info about a dealer finding small amounts of ethanol in gas that was supposed to be ethanol free! I have an ethanol tester and I guess I should start checking the Rec 90 gas I've been buying!
2.This thread was started by a guy that somehow got a lot of water in his fuel, asking what to do about it.
3.Another thread with a very good discussion of ethanol related problems; see post #9 for a discussion of problems/myths/truths of E-10 gas by petroleum engineers; see post #21 for comparison of water and ethanol molecules sizes in microns vs. Racor filter capability.
4.Good discussion on mixing E-10 and Rec 90 gas.

I think Pelican is right - the amount of water that gets into a tank via the vent/moisture condensation is miniscule and I think that was proven by some tests/calculations run by jimh. Will have to see if I can find that post. Water in the fuel most likely comes from the dealers tank, or a leaky seal on the filler cap, a vent line without a loop in it to prevent sea water from entering in rough seas, leaks around the sending unit, or corrosion in the tank! During the ~700 mile S. Fl. circumnavigation trip I made in 2010, I used 158.5 gallons and refueled 9 times with Rec 90 gas at marinas. Since I have the Racor with the plastic bowl and drain fitting, I drain a bit of fuel to check for water every day on such a trip before refueling. I found water after 4 of the 9 refuelings; the places is suspect had water in the gas were in Clewiston, St. James City, Gasparilla Marina, Sanibel, and Chokoloskee. Those places are close enough together, that I wonder if maybe they all got watered down Rec 90 fuel from the same distributor?! I've removed my tank a couple of times and it has zero corrosion on it (not foamed in!), the sending unit is well sealed with Permatex No. 2B gasket sealer, I had replaced the filler cap O-ring before the trip and the vent fitting had a special inverted U in it to prevent water entry, so I'm sure water was in the fuel when I bought it. I found NO water in the fuel after Flamingo or any subsequent fuel stop on the east coast of Fl.

[cdavisdb]

More good info, Bushwacker, thanks. Since I never see water in my Racors except when I'm in the Bahamas, strongly suspect my rec90 supplier is selling contaminated fuel. If not, I'd eventually get some from the bowl, either from the fuel or elsewhere. That was normal before E10 came along. Maybe there are some good suppliers locally. I need a test kit and test ethanol content in all the various fuel sources around here.

Question: how do you know that the fuel you bought that showed no water in your filter was pure Rec90 and not contaminated with enough E10 to absorb any water?

I'll check the vent hose arrangement and fuel cap Oring. What is that "special inverted U fitting on the vent hose?

[McGillicuddy]

Hey Conner,

As far as I know an ethanol tester can be as simple as a graduated cylinder.
I think Denny got his from and aviation shop. Summit Racing and a host of others carry a similar product.

100 ml graduated cylinder ($5-$10 at amazon.com) is easy to work with fill with water to 10 ml top it off with your old fuel or new, shake/stir, let settle and do the math.

As hard as you run your boat in all conditions and the amount of rain you guys get, water could easily be seeping into your tank somewhere. I get what pelican is saying about the finding source of water ingress on your own fuel system, but unfortunately sometimes the water ingress does come from the pump...

I hereby grant you permission to snout punch all who would promote Ethanol.

Heck, even the Iowans making the shit acknowledge its inferiority...

[pelican]

ethanol isn't the problem most people make it out to be...

I had a shop,for a loooooong time !

I NEVER experienced a problem with fuel after winter storage on ANY customer's boats !

that's a fact !

I've had boats that sat on land,for a few seasons - ZERO fuel contamination.phase separation !

the problem is water entering the system - end of story !

fuel fill cap o rings are the most overlooked piece of the pie !

vents in the improper configuaration - facing the wrong way,that's another point

fuel tank itself is another point - hard to believe,i know,but I've seen it on more than one occasion.seen tanks with holes on the top,allowing water in - again,i've seen it a few times


i'm no fan of ethanol fuel !!

but I can tell you truly,if you're experiencing a problem with water or a phase separation in your fuel - you NEED to inspect your fuel system - blaming the fuel isn't going to solve the problem,find the source of the water,solve your problem...

all vent lines should have a loop in them - this prevents water entering the system,via the vent fitting...

[Bushwacker]

Originally Posted by cdavisdb

. . . Question: how do you know that the fuel you bought that showed no water in your filter was pure Rec90 and not contaminated with enough E10 to absorb any water?

I'll check the vent hose arrangement and fuel cap Oring. What is that "special inverted U fitting on the vent hose?

Good question! At the time I had not heard about Rec90 gas being contaminated with ethanol, so I was not checking for that, even though I have a tester for it. Now that I know that Rec90/"pure gas" has been found to be not so pure after all, I will be checking ALL the gas I buy before I put it in the boat!

BTW, here are some tips for using the ethanol tester. Beside the calibrated test tube, you need a container of water (I use the bicycle bottle of drinking water I always have on the boat) and a container for some gasoline (I use a squeeze bottle condiment container like you find with mustard/ketchup in restaurants). You fill the test tube up to the "0%" line with water, and then to the FUEL line with gas, put the cork in it and shake it up. Any ethanol in the gas will combine with the water and settle out at the bottom and increase the quantity of "water" at the bottom of the test tube, which is calibrated in 5% increments above the 0% line, allowing you to read the % ethanol directly. If there is no ethanol in the gas, the water/gas interface will remain at 0%. I typically found ethanol content was between 7 and 10% back when I was using E-10 gas. West Marine has a cheaper ethanol tester, but it looks pretty small and isn't too finely calibrated.

The plastic inverted U vent fitting is shown in pic below on the left next to the the original fitting, which would allow water into the vent line. Don't remember who made it but it had a clever plastic "catch bottle" that clipped to the outside of the fitting that would catch any fuel that spit out the vent during refueling! The plastic fitting eventually broke however, so I replaced it with a similar round fitting with a 90 degree elbow in it. I installed it with the elbow pointing aft and used a longer vent hose with a 360 degree loop in it up in the Seafari's raised coaming several inches above the vent fitting. Seems to do a good job of keeping water out of the tank, and I can still use the catch bottle!