Mountain Grown

just got a brand new mechanical fuel gauge with isolator: from the isolator to the gauge, tube is filled with 50/50 water anti freeze. I bled it properly, but I noticed the fluid level is slowly going down. I can not see any leak at all. My fear is the water is leaking past the diaphram in the isolator and into the fuel side. Any suggestions?

Fishin2Deep4U

It's not, If anything, it would go teh other way. Fuel into the glycol side.

It's still in there, just below your sight line. It will not affect gauge performance.

Dave

Longbob

Not saying that you did the same thing as me, but I had this same problem and it was due to me not having the proper fittings on the isolator that matched the braided fuel lines. Swapped out the fittings and it worked perfectly.

klx650a2

I know this suggestion is not "legal", but ditch the isolator, run a good diesel rated rubber fuel line with a needle valve and good hose clamps right up to the gauge. I had so many leaks with that plastic line it was not even funny...

stevewes2004

X2!! i ditched the compression fittings and plastic tubing and put on 3/8" fuel hose with hosebarb fittings and hose clamps. works like a champ!!

Doj Dewd

i am currently running the plastic line with compression fittings right into the cab from the vp44. i am also using a needle valve.

so far no problems yet, how long did it take before you guys started to see leaks?

Mountain Grown

It started leaking right away. I prefilled the isolator too. I just don't see where it is leaking. So I'm going to detach it from the I.P. side and observe if antifreeze is leaking from the diaphragm.

Fishin2Deep4U

Most guys way over tighten the ferrules. This is the most common leak location.

It takes some practice, but I have not had one leak in years.

Dave

klx650a2

Mine did not leak in summer (well once it did), but all my leaks were in winter. I think with the -30 like you'll get in calgary, it will leak on you.

Dave2001

I sure would like to know the correct way to tighten them. Mine has leaked from day one. I have replaced the ferrules and the lines several times. Now I have grease gun hose on it and it still leaks down, but not as quick. Not sure where, But I think its under the hood at the isolator. Is it possible to use some other type of fluid in there that will not leak like anti freeze? What is the best sealant to use on the threads of the pipe fittings? Any thoughts or help would be appreciated.