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I had this problem after having the plane recovered with the Blue River process in 1985. Discovered this initially when refueling. Cool moist air resulted in the picture similar to yours. Haul it out in the sun and it returned to "normal". Put up with this issue for over 25 years (drove me nuts)...

Were they (O-rings) fuel resistant?

That's what I did! Ordered a couple of Fuel Resistant O-Rings (have a spare now) and a tube of Fuel Resistant Grease from Acft Spruce. Rather than spend $400 on a new valve and $$$ labor on cutting and patching the fabric surrounding it, I thought I'd try the O-Ring and Grease first. So far so good.

1976 PA-18 "150" fuel selector valve leaks. Drained fuel completely and installed new (tiny) O-Ring and reassembled. Flew the aircraft and did not note any leaks. But when the engine was shut down and the aircraft sat for approximately one hour I noticed a "wet" finger when checking the fuel...

We just finished installing the new R1224 voltage regulator (Quality Aircraft Accessories) and checked the electrical system with all lights and avionics systems turned on. The Plane Power R1224 was the answer to my prayers (even though I'm not religious). I want to thank you all for your help!

A quick update: I purchased the Plane Power R1224 from Quality Aircraft Accessories ($200) and removed the old regulator and over voltage relay. The holes in the new regulator didn't match up with the firewall mounting bracket so had a friend drill and install new nut plates on the bracket. This...

I've been giving this a second thought. Rather than purchasing accessories piecemeal and then discovering that wasn't the problem, I decided to contact Quality Aircraft Accessories (formerly Interav) who forwarded me a detailed trouble shooting guide for the alternator and voltage regulator. The...

No offense taken. Will order a new OVR tomorrow. Thanks.

Today I ran some numbers as you requested. With engine off, the battery draw was 12.68. Then with taxi light 12.06, and landing light 11.98. I pulled the OVR circuit breaker and started the acft. With the electrical components on but leaving landing lights off, the ammeter was indicating...

Keep those helpful hints coming. There is a wealth of information in this group! I'll be starting to record some numbers either tonight (10/21) or tomorrow, beginning with the battery's current draw (taxi and landing lights on w/engine off). Battery draw with engine off is 12.68. After that a...

I will put that on my checklist next time I visit the airport. The new LED's are supposed to draw a fraction of the current that the standard 4509 bulbs do. I've also thought about pulling the OVR breaker to see if that makes any difference. I appreciate your response, and if you have any other...

My electrical system goes into discharge nearly every time I turn on the landing lights. I installed new LED landing lights in an effort to solve this problem (to draw less amperage) but the installation did not correct the issue. 1976 PA-18 "150" came with the Interav system: 55 amp alternator...

Thanks for the help! Had a large caribiner around the tail wheel spring and then clipped into it. Thought an eye bolt would even be easier, but fretting the tail wheel yoke casting could get very costly. A nylon web tow strap with loops sounds even better. Appreciate your suggestion.

Just installed a power winch to pull the Cub back into the hangar. Almost impossible to do by hand when it's icy. Thought installing an eye bolt would make towing much easier rather than wrapping around the tailwheel leaf. The only place I've found that "has them" is "Airfasco", and they want...

I rechecked the baffles and did find some minor leakage and subsequently sealed them with high heat silicone. However at cruise setting I didn't see much difference in temps. I've rigged up the plus and minus tubes like you suggested sans copper tubing...as it's hard to find at the local...

Many thanks to CanTom12, Oliver, and Steve Pierce. When I get the manometer and the tubes rigged, I'll report my findings. Thanks again!

I must say there's a wealth of information on this forum! Wish I would have used it sooner! One last question/s re measuring pressure differential between upper and lower cowls: I'm guessing this has to be done in flight rather than static. Can it be accomplished by extending the manometer...

I have had a JP Instruments gauge for a long time. This measures EGT as well as CHT on the 0-320. Even though we've attempted to seal up the baffles (after a rebuild), I'm guessing there's still work to be done. I will use the light again to see if there are any more leaks, check the baffles...

Please excuse my lack of knowledge on "H2O". Could someone please explain that to me? CHT on #3 and #4 are running too high...I've seen 405 on #3 in this "warm" weather. Oil temp normal. We've tried as best as we could to seal up the baffles, but temps are still too high. And not sure if...

I won't know until I reinstall the carburetor, but that's good information to know. Thanks.