Has anyone else experienced some slight leakage from the EFII fuel pump?
I have occasionally caught a whiff of fuel after the plane has been closed up for a while.
During my annual inspection, I needed to pull everything apart to clean and inspect the fuel filter. I noticed a bit of blue stain under the fuel pump, so I pulled it out.
It looks like there is some weepage out of the recirculation check valve where it meets the end plate.
Here is a better picture showing that there is definitely some weeping of fuel.
I decided to disassemble the components and see what I could do to make it leak free. I added some fuel lube around the washers and some Loctite 567 on the various threaded parts. Surprisingly, there isn't really anything preventing the leaks here. No O-rings or seals. Just a very tight fit.
I got it all back together and put it in the plane and ran the fuel pump with the purge valve open. No leaks! Hopefully, this will fix things from fuel weeping.
I have occasionally caught a whiff of fuel after the plane has been closed up for a while.
During my annual inspection, I needed to pull everything apart to clean and inspect the fuel filter. I noticed a bit of blue stain under the fuel pump, so I pulled it out.
![IMG_6497-M.jpg](/proxy.php?image=http%3A%2F%2Fwww.overthehills.com%2FRV-9A-Project%2FPhase-2%2Fi-kQZ3FsZ%2F0%2FM%2FIMG_6497-M.jpg&hash=b71d48a59d99763b2af03ead47e5f5b2)
It looks like there is some weepage out of the recirculation check valve where it meets the end plate.
Here is a better picture showing that there is definitely some weeping of fuel.
![IMG_6498-M.jpg](/proxy.php?image=http%3A%2F%2Fwww.overthehills.com%2FRV-9A-Project%2FPhase-2%2Fi-6tPngWC%2F0%2FM%2FIMG_6498-M.jpg&hash=327d662bccf3f0ea4316b19746651361)
I decided to disassemble the components and see what I could do to make it leak free. I added some fuel lube around the washers and some Loctite 567 on the various threaded parts. Surprisingly, there isn't really anything preventing the leaks here. No O-rings or seals. Just a very tight fit.
![IMG_6499-M.jpg](/proxy.php?image=http%3A%2F%2Fwww.overthehills.com%2FRV-9A-Project%2FPhase-2%2Fi-fjrVQ8J%2F0%2FM%2FIMG_6499-M.jpg&hash=9b016c906b681ee89080c87209cc4334)
I got it all back together and put it in the plane and ran the fuel pump with the purge valve open. No leaks! Hopefully, this will fix things from fuel weeping.