Robert A. Reed

Thanks Turbo! Will give that a try!

Tach reads 125 RPM slow at WOT. Verified by electronic meter. If it was the cable turning slow, it would have been twisted off long ago!

Yup, checked underneath access! No way! MP plumbing and voltage regulator in the way!

Need to replace or overhaul the mech tach on my 1979 M 20 J! Does the entire right side of the panel have to come out, or can it be accessed from the top through the glare shield??

Bought my 201 a year ago! Love it! The POH alludes to the "In Tank Markers " for 25 Gal of fuel. The POH does not show it, or explain the markings on it? The former owner did not know how to interpret them even after having owned the plane for many years! He kept the tanks topped off and never worried about a reduced fuel situation, as he always flew alone! Can someone Please explain to me how to read them! There is several numbers and letters on them which say absolutely Nothing!! Are you at 25 Gal at the bottom of the tab Or,,,,,,,,,,,,,,,,,,,, Thanks, Bob Reed N4815H

I thought that is what you meant Bob! BTY, how does the Rocket fly? I had a N35 Bonanza with a 260 in it. Always something Expensive wrong when I wanted to fly! Sold it. Got a 201. The 550 must be a blast! Bob

Bob, got it from "Chiefs". About $36.00! I don't have the exact part# in front of me, but you can search it on Chief's web site. Last 4 numbers of part # was 2000.

I have flown the plane a couple of times since new transducer. Holds 22 lbs in flight! Fuel flow is normal! Fixed!! Bob

There was not anything in the fuel line. The particles came out the small orifice of the transducer. I think the inerts disintegrated! Bob

Greg, I put new O rings in the sump drain. Ran it up. Still had the problem! Did a full power check. Fuel Flow was solid, but fuel pressure did not improve! About 10psi. I put it back in the hanger! My mechanic told me it probably needs a new Fuel pump, or the servo needs overhaul! I pulled the old fuel pressure transducer (probably original), it had small grains of Something coming out of it! I put on new transducer! Checked for leaks. Ran it up! It held 24-25 psi just fine!! I think the problem is solved! I will check it again when I get the cowling on and fly it! Bob

I tried your test today! Some throttle, mixture in, boost pump on! Fuel pressure jumped to 25 lbs.(Good)! Pulled mixture and throttle. turned off boost pump. Pressure held at 25 for about 3 minutes, then slowly dropped to 14 after 5 minutes. I turned the key, started the engine, the pressure immediately dropped to 8 lbs! Activated the boost pump, and it went up to about 10 lbs? Increased RPM. No change in pressure? WTH?? Engine Pops every so often, like too much Air? HELP! Bob

Sorry, I did not take any pictures. It was a small black gob next to one of the ports on the bottom of the stem. I am thinking it came from the outside as It was sticky enough that I don't think it would have been able to flow from the tank! The port that it was next to is immediately above the O ring on the stem drain. I found that the previous owner had used a very sticky "fuel proof" grease when he re-assembled it, to prevent leaks. The drain O ring was covered with this sticky stuff, and had lots of dirt stuck to it. A reply on another subject had this problem. The sticky grease prevented the drain from leaking, but it let air in! (I may be grasping at Straws)!! But,,, I have cleaned it up and re-installed. Am waiting to make sure it doesn't leak. Then will move on! Do another run up and see if there is any change. Bob

Thanks Jose, will try it! Bob

Yes, I do have FF gauge. Haven't noticed anything unusual, but have been so focused on the fuel pressure that I may have missed something! I have a small black gob of stuff in the bottom of the gascalator bowl. May be remnants of an O ring? It could not have gotten in through the screen! Screen is clean. Bowl was cleaned 5 hours ago at annual!! There is a small O ring on the end of the spring loaded (drain) shaft. It seats in the nut that is on the bottom of bowl. I can see that it could be possible to damage it if probed with a drain cup! Bob

Could the gasolator drain have the same problem? Sucking air around the shaft? I have noticed some fuel stains on the shroud around the drain "pull handle" inside the plane! I also smell some fuel inside the cabin if I do not turn the fuel selector to "off" . Bob

Yes, thanks. I am checking fuel vents. I have switched tanks several times with no change in pressure! Would a bad selector valve cause these problems? Bob

I am glad to hear that I am not the only one experiencing this problem, which is usually the case! I am going to start with the first piece of equipment in the system. If it is warm enough to lay on the hanger floor tomorrow, I will clean the gascolator and boost pump screen. I have read that if there are no fuel leaks, it could be sucking air. Sucking air with no fuel leaks would have to put the problem in front of the boost pump? One person had a crack in the line, another had a bad gasket! My mechanic comes back into town tomorrow, and hopefully has some more ideas! Replacing the fuel pump is not my idea of fun either! I will keep you posted on anything we find! Please do the same. Thanks

Thanks! After seeing all of the threads, I am skeptical as to weather it is a fuel pump problem! I will follow your advice and do some more diagnostics! I will post what we find! My mechanic is on vacation in Florida now and I am trying to get a jump start and give some advice as to what he may want to do to fix this problem when he returns! You guys are very helpful!! any other solutions would be appreciated!

Thanks Clarence! Do you think the fuel pressure transducer could be the cause of the change in pressure as it warms up? That would definitely be an easier fix than a new fuel pump! I see that Chiefs has them for $36.50, and they are a lot easier to get at than the fuel pump! I am a new Mooney convert! Don't want this to spoil my introduction to the 201! Just sold a Bonanza that always had some problem when I needed to use it!!

Yes, we ran the boost pump with mixture at idle cut-off. Cowling removed. Could not see any leaks! It doesn't make sense that the pressure would drop as the engine warms? The people that sell fuel pumps are telling me that ii is a weak fuel pump? Maybe, although I have never had to replace a fuel pump on any plane I have owned. I have had to replace boost pumps! This pump was new at major overhaul 715 hrs ago! 2002. I would like to run some sort of test on it to prove the mechanical pump is bad before I start removing enough accessories to get at it and take it out!

Fuel pressure is fine, green arc on start up. Pressure slowly drops to 6-8 as engine warms up. Boost pump brings it up to 14 and holds steady. Does that sound like a fuel pump going bad? Was fine the last time it was flown. Sat 2 weeks and had this problem?