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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  fuel sender unit problems

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Author Topic:   fuel sender unit problems
68 dailydriver
Journeyman

Posts: 19
From: North CA.
Registered: Mar 2003

posted 04-22-2003 08:14 PM     Click Here to See the Profile for 68 dailydriver        Reply w/Quote
I have just installed a new fuel sending unit in my gas tank. When I fill the tank, the gauge reads 3/4 full. I will run out of gas when the gauge hits the 1/4 full mark. Which way do I bend the rod that connects to the float, up or down, in order to get a correct reading from the fuel sending unit.

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kcode
Gearhead

Posts: 3415
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 04-22-2003 11:38 PM     Click Here to See the Profile for kcode        Reply w/Quote
My first guess would be that you have the wrong sending unit, since you are out on both ends, full and empty on the fuel gage.

Mike

N266fords
Gearhead

Posts: 1662
From: Sierra Vista ,Az USA
Registered: Apr 2003

posted 04-23-2003 01:52 AM     Click Here to See the Profile for N266fords        Reply w/Quote
did you have problems befor the change as you could have a bad wire that is reading to much resistance and your rod is not adjusted correctly put an ohm meter on it full and then empty to check your out put of the sending unit the do the same on the wire at the guage to see if you are in the ball park

Ryan Wilke
Gearhead

Posts: 3237
From: Stanton, Michigan, zip 48888
Registered: Oct 2000

posted 04-23-2003 08:48 AM     Click Here to See the Profile for Ryan Wilke        Reply w/Quote
Have any of you guys had a problem with getting the sending unit to seal at the tank? Well, I am!

The tank and the sending unit is new, not bent or rusted. The compression rubber gasket looks good, but it still leaks.

Would a silicone-type sealer work with the rubber gasket?
Any other suggestions??

Thanks, Ryan

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 04-23-2003 09:27 AM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
Ryan, use Vaseline petroleum jelly.

No, no, no!!! On your sending unit!

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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indyphil
Gearhead

Posts: 3394
From: Senoia, G.A. USA
Registered: Jul 2002

posted 04-23-2003 03:52 PM     Click Here to See the Profile for indyphil        Reply w/Quote
I installed a new sender on my 68.

I used a new gasket (its a couple of bucks but takes the guesswork out of the job) it seals fine but i did make sure to clean up both surfaces too.

Mine reads fine, although unlike modern cars it doesnt read above full when its full it just reads on the full line.

You can test the system by grounding the wire on the gas tank or on a good ground nearby on the chassis. The gauge should read full if you ground the wire. If it does then you know the gauge and wire is good and the problem must be with the sender or the float. If it doesnt read full then maybe the wire, dash voltage regulator or gauge is bad.

hope this helps
Phil

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'68 coupe 289 C code
66 heads, edel 600cfm carb, performer intake, dual exhaust

Ryan Wilke
Gearhead

Posts: 3237
From: Stanton, Michigan, zip 48888
Registered: Oct 2000

posted 04-23-2003 04:14 PM     Click Here to See the Profile for Ryan Wilke        Reply w/Quote
quote:
Originally posted by SteveLaRiviere:
Ryan, use Vaseline petroleum jelly.

No, no, no!!! On your sending unit!


Apparently you've determined a second use for the slippery stuff, ay Steve?!

Thanks for sharing your expertise!
Ryan

bibbs68
Gearhead

Posts: 1732
From: Medina, TN
Registered: Sep 2000

posted 04-23-2003 05:09 PM     Click Here to See the Profile for bibbs68        Reply w/Quote
I installed a new sending unit on my '68 about 2 yrs ago and have had no trouble out of it at all. All the suggestions above are right on. How do I know? Well I found myself asking the same questions when I was doing my install.

If you are still getting a leak after using the vasoline, check, check, and re-check the gasket, tank, and sending unit for any scratches, pitting, or bent/dented spot. If all the parts are not flat you won't get a good seal.

You guys are great! And of course, a wealth of information pours from your minds to the keyboard.

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