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  #11  
Old 08-14-2015, 10:38 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by jrich View Post
However, we are somewhat wary because others are telling us that it can't just be explained as vapor lock.
If you are still not sure, drain the tank and put in 10 gal. of 100LL and repeat your testing. I think you will probably have different results, but if not, then you have an additional data point. The small amount of 100LL will not effect your maint. or oil change interval.
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  #12  
Old 08-14-2015, 10:47 AM
jrich jrich is offline
 
Join Date: Apr 2012
Location: Arnaudville, LA
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We have flown before in hot weather with the same fuel. But, maybe the conditions were severe enough. We surely hadn't added hot fuel to the fuel tank before. I'm confident that adding hot fuel was a bad idea.
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  #13  
Old 08-14-2015, 11:50 AM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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FWIW I use ARCO Premium 91 RON with 10% ethanol. This is the first time I have experienced vapor lock.
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  #14  
Old 08-14-2015, 11:50 AM
Mich48041 Mich48041 is online now
 
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Location: Riley TWP MI
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The problem could be vapor lock. Some RV-12s have also experienced similar engine sputtering due to a bad engine driven fuel pump. I am not saying your problem is the fuel pump, but it is something to consider as a possibility.
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  #15  
Old 08-14-2015, 12:03 PM
sailvi767 sailvi767 is offline
 
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Location: Charlotte NC
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Quote:
Originally Posted by jrich View Post
We have flown before in hot weather with the same fuel. But, maybe the conditions were severe enough. We surely hadn't added hot fuel to the fuel tank before. I'm confident that adding hot fuel was a bad idea.
Keep in mind with auto has you really have no idea if it's the same fuel. I won't get into shipping methods and gypsy tankers. The tester mentioned would be a nice thing to have.
G
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  #16  
Old 08-14-2015, 01:38 PM
jrich jrich is offline
 
Join Date: Apr 2012
Location: Arnaudville, LA
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I have a Peterson vapor pressure test kit (syringe & gauge) that I purchased and used when I got my STC for my Cherokee 235 to check the vapor pressure of the fuel. While I owned the Cherokee, I sampled every fuel load (non-ethanol, 87 octane) that I purchased for the acceptable vapor pressure limit which the STC allowed. How would I go about determining the acceptable vapor pressure limit for the RV-12? Would I have to log numerous data points with varying temperatures and atmospheric pressures. I'm not sure of all of the parameters that I should vary or whether I'm competent in this area to even do justice to such a study. Anyone have suggestions?
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  #17  
Old 08-14-2015, 02:00 PM
cactuspilot cactuspilot is offline
 
Join Date: Oct 2012
Location: Phoenix, AZ
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You may also want to check your gascolator screen, and see if your engine driven pump is subject to any recall, and make sure your facet aux pump is working properly per the PAP fuel flow test.
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  #18  
Old 08-14-2015, 06:38 PM
jrich jrich is offline
 
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Location: Arnaudville, LA
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Quote:
Originally Posted by cactuspilot View Post
You may also want to check your gascolator screen, and see if your engine driven pump is subject to any recall, and make sure your facet aux pump is working properly per the PAP fuel flow test.
Thanks for your suggestions. Since the problems, we have opened the gascolator, took out the screen and found minimal trash. Definitely had nearly 99% of the screen available for flow. Since we suspected vapor lock due to our probable shutting off of the electric fuel pump per our past standard operating procedure, the electric fuel pump test was probably not needed. But, we went ahead and did the PAP fuel flow test on the Facet electric fuel pump to make certain that the electric fuel pump was not restricting flow and it passed the PAP pumping test. In fact, the time to pump 1 gal. was far less than required and even less than the first PAP after construction. The mech. fuel pump is the new style, Corona fuel pump that by S/N does not fall under the Rotax S.B. The Corona pump was installed (3) yrs. ago and has approx. 150 hrs. on it.

Thanks Cactuspilot!
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  #19  
Old 08-14-2015, 08:13 PM
jrich jrich is offline
 
Join Date: Apr 2012
Location: Arnaudville, LA
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I've dug out my test kit and found what I believe would address the testing of fuel issue. I took pictures of the instructions for estimating the Reid Vapor Pressure (RVP) along with my tester and its instructions.

If anyone is interested in the pictures, send me your email address and I'll send the pics.
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  #20  
Old 08-14-2015, 08:48 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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John,

You seem to have extensively tested autogas. What are your thoughts on the variability of results?

Rich
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