Fuel Sending Unit

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Oct 29, 2013 | 02:02 PM

1987_XLT_Lariat_F250

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Joined: Oct 2013

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From: Fayette County, Ohio

Fuel Sending Unit

Hello everyone, I'm new to the site but I really like it and plan to use it a lot.

So I have a carbureted 1987 F250 and I'm having issues with what I beleive is my fuel sending unit. My gas gauge always reads past full, and it starts to move around and then reads a 1/4 tank when it is seemingly empty. I have read around and I think it may be the ground wire to the sending unit but I am unsure. I got this truck from my grandfather for my 18th birthday and I have rebuilt it, got another carb, and made it a daily driver since. If anyone has some tips like checking the resistance in the wires and checking the ground itself, it would help me alot. I dont have a diagram in my Haynes manual that shows where the ground to the fuel sending unit is located.

Thanks!

Oct 29, 2013 | 03:06 PM

subford

Fleet Owner

Joined: Aug 2005

Posts: 23,667

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From: Easton,Ks

This problem is caused by a coating on the resistance element of the fuel sender and may clear up on its own in time if you use it for a daily driver.

Does this truck have a 460 engine in it?

Oct 29, 2013 | 03:29 PM

1987_XLT_Lariat_F250

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Freshman User

Joined: Oct 2013

Posts: 37

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From: Fayette County, Ohio

Well its always been that way on the truck. Im not experienced enough to find the wire haha and it has a 351 windsor in it.

Oct 29, 2013 | 04:13 PM

subford

Fleet Owner

Joined: Aug 2005

Posts: 23,667

Likes: 301

From: Easton,Ks

Does this truck have a 460 engine in it?

This diagram may be close if it has a 460 in it:

Oct 29, 2013 | 04:46 PM

kermmydog

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Joined: Oct 2003

Posts: 9,176

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From: Western Central NV

I had an 86 F250 4x4 with a 460 & the only way I was able to fix the same exact problem was to replace the pump unit. As I remember back then (in the 90s) they were only available through Ford & sold as a complete unit, (pump & sending unit.) so if you can buy then separate or not today I don't know. But either way the tank must come out.