Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 03-19-2014, 09:06 PM
KsCop's Avatar
KsCop KsCop is offline
Step Out of the Vehicle..
 
Join Date: May 2013
Location: Haysville, KS
Posts: 919
KsCop is gaining momentum as a positive member of FTE.
Fuel Level Issue

As expected, once I got the truck on the road I'm finding issues to fix. In this case, it has to do with an inaccurate fuel gauge.

I filled both tanks, gauge reads full. Drive around for a few days, front tank reads empty. Switch to rear tank, gauge shows full. A few more days, gauge reads empty and front tank still reads empty.

Fill rear tank and it only takes six gallons. Same with the front tank.

I'm thinking the sending units are not working right, but odd that both would be off by the same amount. Is there a way to test them without dropping the tanks? Can they be replaced without dropping the tank?


Thoughts anyone?
__________________
1985 F150 4x4 4.9 I6, 4 speed w/granny
1963 F100 4x4 292 Y-Block, 4 speed w/granny
2005 Chevy Uplander
(The OttoMobile - Only vehicle the Great Dane fits in)
2005 Pacifica (Wife's Ride)
Reply With Quote
  #2  
Old 03-20-2014, 02:49 PM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 32,550
Franklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant future
The sending units have a high failure rate on these trucks. The way they are made they wear out prematurely. I suspect both are bad.

If you want to run a test, take the wiring plug loose to the sending unit, find the sending unit wire(usually yellow blue or blue/yellow) and with the engine off'key in run, ground this wire at the sending unit and then unground it. The gauge should read full scale back and forth when you do this. If it does, the guage/wiring and switch are good, the sending unit is bad.

You can get to the front one barely. The rear tank will have to be dropped or the bed taken off.
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
Old 03-20-2014, 02:49 PM
 
 
 
Reply

Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Couple dual tank issues Iantiler Fuel Injection, Carburetion & Fuel System 17 02-08-2014 01:30 AM
Question on fuel selector valve - dual function reservoir SSellers 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 20 12-24-2013 12:47 AM
89 F250 Dual Tank question I_am_Seeker 1987 - 1996 F150 & Larger F-Series Trucks 8 09-13-2013 12:48 PM
1987 f150 fuel system problems wingless93 1987 - 1996 F150 & Larger F-Series Trucks 0 03-23-2013 11:04 AM
Strange problem with dual gas tanks. Phobia16V 1987 - 1996 F150 & Larger F-Series Trucks 29 02-06-2013 10:33 PM



All times are GMT -5. The time now is 10:04 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup