Dual tank problem
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Dual tank problem
I have a 1989 Ford F150 with dual tanks. The problem I'm having is that when I switch to the rear tank it stays full & emptys the front tank. When the front tank is empty the truck won't run. Visually the fuel gauge changes so the switch seems to work. I replaced the rear tank fuel pump with no change. Any suggestions.
Cross-Country
Joined: Nov 2005
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From: Portsmouth, OH
the solenoid is on the driverside framerail. it's a 6 port solenoid/valve assy on my 89 f150 efi.the haynes manual covers it in chapter 4 page 11. no pics of it though. Mine's also a pressure activated solenoid/valve, so I'm pretty much going to have to go to ford for the part when it gives up.
hope this helps
trgrhappy
89 F150 5.0 EFI 4X4
hope this helps
trgrhappy
89 F150 5.0 EFI 4X4
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My truck has a 6 port fuel supply reservoir that is not activated by a solenoid, its some type of presure operated device. Federic said a solenoid on the fuel rail which would be an electrical operated device up close to the injectors or presure regulator. 
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
There is no solenoid. Only the 6 port fuel supply reservoir like tuntloan said.
Here is a drawing of it.
Here is a drawing of it.
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New User
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I have an 89 f150 4.9 that has the same problem thanks for the help, I was wondering if this canister could also cause problems when running after my truck hits running temp it starts acting like it is starving for gas. Any thoughts Thanks Boatbum
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Joined: Nov 2005
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Just replace the fuel tank selector valve as pictured above. Your problem is that it has failed and is allowing crossfeed. The valve is NOT electro-mechanical, but rather pressure ONLY activated. I just had the EXACT same problem on my 89 f150 w/dual tanks. Hope this helps
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Joined: Dec 2005
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Is this the mixing bowl with the 6 lines in it on the d.s. on the rail ?? I think I can get one from ford . Or is there some where it could be ordered ? and can it work OK cold but fail when the truck worms up ? Thanks 4 the Help boatbum
