Sport Pilot Talk

Roger, thanks for pointing out the "restrictor" in the return line is actually a Mikuni carb jet. I had a job getting mine out. They put it in with LocTite and the tiny little screwdriver slot took it in the shorts. I was able to go to the local Polaris store and buy a better jet with a sh...

My low fuel pressure issue in the StingSport came back in spades yesterday. I flew to Valle (40G) in northern AZ, spent a couple of hours at the museum there, then left for Cedar City in the middle of a hot afternoon. Taxied out and did normal runup.... when I opened the throttle and started the tak...

Glad your issue finally resolved itself. My issue was occurring with both MOGAS and 100LL. Issue resolved by updating the fuel system, with the primary components being a check valve, hose rerouting, and new banjo fuel block from Rotax. Results are more stable pressures and a highly effective appli...

I haven't seen any fuel pressure squawks here for a long time. Did the problem go away all over the country? A nationwide change in fuel formulation is the only thing I can think of that would explain that.

I haven't had a low fuel press warning light for months.

Roger, I believe you are 100% correct about fuel pressure senders, etc. But do these things fix themselves? I haven't touched anything in the airplane since before the problem went away. I did change out my FP sender but that was a long time ago.

FYI: I haven't had a low fuel pressure condition in my StingSport since late last summer. I switched to Chevron premium back then. After a couple of months I went back to Shell premium with their new mystery additive. Nothing changed in the airplane. The weather is cooler and the fuel is different, ...

Back in the old days, automobiles used an engine-mounted pump to "suck" fuel out of the gas tank. This resulted in a pressure lower than ambient in the fuel line between the gas tank and the pump inlet. Since part of this line was in the engine compartment where things got hot, fuel in the...

2.2 hr cross-country yesterday in the Sting. Fuel pressure solid >3 PSI all the time. Free air temp at cruise altitude ~48 F. Shell gas? Cooler winter temps? Who knows.

I hadn't seen Fast Eddie's comments when I wrote mine, but it sure sounds like we're on the same page.

UPDATE: I have spent MONTHS and $$$$ diligently trouble shooting this! Replacing parts, researching everything, contacting the US importer, communicating with other owners with similar problems, etc. Here's where it's at: 1) Mechanical fuel pressure gauge testing correlated with the Dynon readings....

1.5 hour scenic flight today. 40 minutes or so up at 11,500. Fuel pressure steady, >3.5 PSI. Still using Shell Premium. FWIW.

Right on about pressure in a closed system. Google Pascal's Law. 1 PSI is not much pressure. It's getting down to the point where you need a manometer or some exotic, calibrated gauge to make a really accurate measurement. There are other reasons to think the low fuel pressure indication is NOT inst...

3+ hour cross country today. No low fuel pressure indications. Still using Shell "V-Power" premium. ??????

Another thought: when Shell announced this new "V-Power" I was skeptical. They don't say what's in it, unlike Chevron's Techron which has a description on the net ("Techron uses a polyether amine (PEA)-based chemistry that's unbeatable at cleaning and protecting your engine"). I'...

Yesterday I did a 4 hour cross-country... fuel pressure was solid above 3 PSI all the time. In fact, I started using that new Shell "V-Power" premium about a month ago and I don't think I've had a low fuel pressure indication since. Coincidence? Probably, but whatever it is, I like it :D B...