JGB

I want to replace the fuel sending unit but even after I have opened the filler cap to vent the pressure of the contracting/expanding fuel, it doesn't seem to alleviate the pressure when attempting to unscrew the sender unit from the tank. Are there any other tricks or have any of you experienced this type of problem and have a remedy for it? The boat was out in the sun all day yesterday so I am certain the gas expanded but I am still confounded by this issue since opening the fill cap should take care of any pressure.

Thanks for any input.

Jim

fund razor

Do the job in the AM.

Worked for me.

Just make sure the new sending unit arm will travel as low/high as the last one. The new generic sending units usually have to be adjusted somewhat. Otherwise you will be reading too much or too little all the time.

I didn't do this carefully enough and ended up with the world's biggest "reserve." Sending unit dropped to empty and I still had 1/3 tank.

fund razor

Less gas in tank helps too.

JGB

very good responses , thanks, the tank is pretty full and like I said earlier it did sit out in the sun alll day. I still didn't think opening the filler cap wouldn't alleviate the pressure enough to do the job. I guess the easy solution would be to siphen out some fuel from the fuel fill and try my luck again tomorrow morning. Thanks again guys! Much appreciated.

Jim

fund razor

I siphoned some out of mine using a plastic tube with a plastic ball in it.
It was a crude pump, but had no electronics/electrical.
Then I just ran that fuel in my lawn mower so I didn't have to pour it back in without a ground.

I got it at the hardware store. I was paranoid about combustion sources. I unhooked the batteries, too.

If you work pretty quickly, you will have the old one out and the new one in before the fumes get too bad.

JGB

FWIW, I was also told the boat should be level. So I figure If I syphon some fuel out, make sure the boat is level, open the fuel cap, and do the procedure in the morning... I should be good to go to exchange the sending unit. I also hope this may help anyone else that encounters this issue when changing a fuel sender.

Thanks for your help Fund Razor!

Jim

fund razor

No problem.

Glad to share the projects I have overcome already.

In a different thread, I'm looking for help with my own mysteries! I have a couple things I'm scratching my head over. While I was trying to help you, somebody has probably been trying to help me. It's a beautiful thing.

Just don't blow the boat up!