Oil sending unit leaking
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,257
Likes: 1
From: Scottsdale, AZ
Oil sending unit leaking
No matter what I do, this thing always seeps... Anyone have this trouble?
351w, dolphin gauges and sending unit. You can see it in this pic if you zoom in
351w, dolphin gauges and sending unit. You can see it in this pic if you zoom in
Logistics Pro
Joined: Nov 2006
Posts: 3,672
Likes: 367
From: Fallon,NV & Bainbridge OH
I can't tell (because I am to stupid to make it zoom on the computer) but if it is leaking around the threads try pipe dope instead of teflon tape. At least it looks like teflon tape in the photo to me.
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,257
Likes: 1
From: Scottsdale, AZ
I have been using Teflon tape. I'll try the pipe sealant liquid stuff.
Elder User
Joined: Jun 2015
Posts: 791
Likes: 11
From: Louisville
Permatex advises (at least their rep' that came and held a class at our shop) that both tape and dope should be used together for best seal. The trucks I work on have many air and fluid lines and I don't have time to piddle with not using both. I never have any leaks doing it this way.
oldmerc
Joined: Jul 2011
Posts: 1,538
Likes: 5
From: Edmonton,Alberta
Teflon tape is no a sealant , it is a lubricant that allows the friction fit seal of NPT junctions to thread together enough to seal . If the NPT fitting is cut too small you will need some kind of goop (preferably hardening) to seal it up .
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Lead Driver
Joined: Aug 2006
Posts: 8,093
Likes: 652
From: Brentwood, TN
The depth of that threaded hole is SHALLOW...if you are having trouble getting a good seal I would look into the possibility that the sending unit is actually bottoming out. The only reason I know about this is because I recently had to rework that hex rod on my 351W to add a sender for my aftermarket oil pressure gauge...the big sender on the end of the rod is an electric fuel pump cutoff switch.
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