Fuel selector switch bad?
#1
Fuel selector switch bad?
hi, i have a 90 f150 w/duel tanks the problem is that my fuel pumps are not working when i turn the key ON, also the gas gauge is no longer accurate i put a test light on the fuel pump selector switch and it gave me a very DIM light, i then put the light on my power door lock switch (just to make sure the test light was working) and it lit up very bright. i then unplugged the fuel selector switch and put the light on the connector itself and nothing no light. i grounded the #6 on the EEC connector and the fuel pump relay is working. would a bad fuel selector switch cause the fuel pumps to stop working? along with the gas gauge? and also i need to know what color is the power wire on both tanks so i can see if there is power back there thanks Darrin
#2
Mechanicalmike08
IM not sure but on the 90 is there a separte fuse in the block that takes care of the fuel pumps because i think my 95 does but yea if the switch is bad too it will cause problems, usually the truck will only crank and wont start
#3
I have a 93, suspect fuel switch in cab
Hi Mechanical Mike 08, so if the switch goes bad, I have a crank no start, can it go bad just sitting? I have a weird front tank prime sound, and the rear will no longer prime, is there a way to test the switch?
#4
Senior Member
Your best bet is to check fuel pressure and that will tell you if fuel is reaching the fuel rail. A bad pump is more likely than that switch going bad.
The following users liked this post:
93 Fseries (12-23-2023)