Home 
Home Search search Menu menu Not logged in - Login | Register
> Jensen Healey & Jensen GT Tech > Fuel Stuff > Fuel Tank Sending Unit Float Puzzle

 Moderated by: Greg Fletcher
New Topic Reply Printer Friendly
Fuel Tank Sending Unit Float Puzzle  Rate Topic 
AuthorPost
 Posted: 01-05-2019 06:03 pm
  PM Quote Reply
1st Post
noomg
Member
 

Joined: 08-02-2018
Location: Long Beach, California USA
Posts: 449
Status: 
Offline
After completing bodywork and paint and getting everything reassembled and buttoned up I fired it up and the gas gauge showed about 1/4 tank, after fill up it still showed a 1/4 tank. The gas gauge worked before the repaint project so I figured it was the sending unit, I was right.

The hardest part was to get the gas level below the sending unit(but that's another story). When I pulled the sending unit I found the float was about 2/3 full of gas. The mystery was I could find no holes or cracks in the float. I even set it out in the sun hoping the heated gas would expand and reveal any micro leaks, no joy.

I finally just drilled a small hole to drain the gas and sealed the hole, problem fixed. I still haven't figured out how the gas got in there in the first place. I'm wondering if anyone else has encountered this.

Back To Top PM Quote Reply  

 Posted: 01-05-2019 06:40 pm
  PM Quote Reply
2nd Post
redracer
Member
 

Joined: 09-10-2012
Location: BROOKHAVEN, Georgia USA
Posts: 646
Status: 
Offline
yes; it was/is a common problem and the "hole" is right where the end of the metal holder/arm clasps onto the nylon. Anytime I removed one, I grind/smooth that sharp end to avoid this. (am surprised you found something to seal the nylon; did it make the float too heavy? Have plenty of good spares if that one doesn't work)

Back To Top PM Quote Reply

 Posted: 01-05-2019 07:56 pm
  PM Quote Reply
3rd Post
noomg
Member
 

Joined: 08-02-2018
Location: Long Beach, California USA
Posts: 449
Status: 
Offline
Red,

When I examined the float for leaks I did notice the depressions left by the wire attachment but the plastic, while depressed showed no signs of puncture and showed no signs of leakage while sitting on that end in the sun for several hours. So while that's the most likely place to leak I was unable to make it leak, anywhere. It's a mystery.

As far as sealing the hole, just a dab of 5min epoxy and it's good to go. When you ask "did it make the float to heavy?" the epoxy-no, the gas in the float-probably.

Back To Top PM Quote Reply  

 Posted: 01-07-2019 08:24 pm
  PM Quote Reply
4th Post
noomg
Member
 

Joined: 08-02-2018
Location: Long Beach, California USA
Posts: 449
Status: 
Offline
With the problem fixed(not solved)it leaves me wondering if it will return since I couldn't figure out how the gas got in in the first place. It could be a micro leak that I couldn't find, if so how long will it take to fill it again. The gas gauge worked until the float was 2/3 full, that's 44 years. The float has been sitting in gas for that long, I wonder if it's possible it absorbed enough gas over that time until it wouldn't float. It seems as though if it had happened fast there would be a noticeable problem with the float, a crack, hole, something.

Back To Top PM Quote Reply

Current time is 01:39 pm  
> Jensen Healey & Jensen GT Tech > Fuel Stuff > Fuel Tank Sending Unit Float Puzzle Top




UltraBB 1.172 Copyright © 2007-2011 Data 1 Systems