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Faulty fuel sender [message #252655]

Thu, 19 June 2014 16:34

Jp Benson

Messages: 649
Registered: October 2011
Location: Fla

Karma: 2

Senior Member

I performed a pressure check on my fuel tank and found the seal on the pickup tube leaking.

http://www.gmcmhphotos.com/photos/fuel-supply/p55022-pressure-test.html

Removing the pickup I noticed the metal plate on the sender had separated from the plastic body.

http://www.gmcmhphotos.com/photos/fuel-supply/p55013-fuel-sender-problem.html

This sender has never been used. When it gets hot the plate separates. When it cools off the plate clams back up to the body. However, the pivot for the float arm came out it's socket and made the sender inoperable. I removed my other "new" sender and found the same problem. In a previous thread someone mentioned that "new" senders weren't very reliable. Maybe this is why. My remedy was to bolt the two pieces together.

http://www.gmcmhphotos.com/photos/fuel-supply/p55014-fuel-sender-repair.html

JP

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Re: Faulty fuel sender [message #252686 is a reply to message #252655]

Thu, 19 June 2014 19:47

midlf

Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)

Karma: 1

Senior Member

Jp Benson wrote on Thu, 19 June 2014 16:34

I performed a pressure check on my fuel tank and found the seal on the pickup tube leaking.

http://www.gmcmhphotos.com/photos/fuel-supply/p55022-pressure-test.html

JP

What pressure did you have on the tank when the pickup/sender seal started leaking? I spent a lot of time fussing with mine. I found that at rated pressure specified in the manual (CRS, can't recall the number) I had no leaks. At double that pressure, somewhere around 4 or 5 psi, there was nothing I could do to stop the leaks. Just my experience.

Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

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Re: Faulty fuel sender [message #252708 is a reply to message #252686]

Thu, 19 June 2014 21:45

Jp Benson

Messages: 649
Registered: October 2011
Location: Fla

Karma: 2

Senior Member

Not sure what the pressure was since I used a cheap garden sprayer to pressurize the tank. The leaking air was loud enough to hear. I cleaned the mating surfaces and carefully reseated the seal. The second time the tank was obviously bulging in the middle and did not leak for the entire 30 minutes it was pressurized.

JP

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Re: Faulty fuel sender [message #252709 is a reply to message #252655]

Thu, 19 June 2014 21:53

lotsofspareparts

Messages: 726
Registered: May 2014
Location: Arlington, WA

Karma: -9

Senior Member

Be super careful anytime you try to pressurize a fuel tank.

The Fuel tanks we use are pressurized to 3 psi and that is it.

Doesn't take a whole lot more to blow out a tank, which I have seen happen in my industry.

Jared

Jared & Tina Lazaron + 14yr old Daughter..... 77 Eleganza II "Recherché"..... 73 Canyon Lands 230 "Elephant"

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Re: Faulty fuel sender [message #252719 is a reply to message #252709]

Fri, 20 June 2014 00:01

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

lotsofspareparts wrote on Thu, 19 June 2014 19:53

Be super careful anytime you try to pressurize a fuel tank.

The Fuel tanks we use are pressurized to 3 psi and that is it.

Doesn't take a whole lot more to blow out a tank, which I have seen happen in my industry.

Jared

I used a shop vacuum when I pressurized mine.

Roy Keen Minden,NV 76 X Glenbrook

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