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Old 01-22-2012, 04:49 PM   #1
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Default 1993 dual fuel tank issue......

I have a 1993 f150 2wd 300 straight six with the dual tanks....I replaced the intank fuel pumps about 2 months ago...the rear got a motorcraft and the front got a spectra..... They both work great and both have a fuel pressur of about 50-60..... For some reason i will fill both tanks up, I use the front tank first till it is low on fuel, then switch to the rear. Once the rear is almost empty, Ill switch back to the front and there will be about a quarter tank in there!!!!!!!!! What is going on and how do I fix the problem......

Also would the fuel vapor canister have anything at all to do with this????????? Also what is the purpose of the canister....

Thank you so much!
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Old 01-22-2012, 07:54 PM   #2
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Anyone got anything on this issue?
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Old 01-22-2012, 08:05 PM   #3
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I read another thread (will try to find it again) talking about dual tanks that would transfer fuel from rear to front tank and they talked about the selector valve not working correctly.



http://www.f150forum.com/f13/fuel-sy...nction-133536/

Hope this helps
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Old 01-22-2012, 08:33 PM   #4
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Quote:
Originally Posted by bpardo19 View Post
Also would the fuel vapor canister have anything at all to do with this????????? Also what is the purpose of the canister....
Fuel vapor canister collect the fuel fumes (vapors) from the fuel tank vent when you start the truck the fumes are removed with the vacuum system and burned in the engine
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1985 F150 XLT Lariat 5.8L (351w) HO 4bl 4X2 ext cab. 8 foot bed.
"Some people spend a lifetime wondering if they've made a difference, Marines don't have that problem." President Ronald Regan 1985
D.A.V. USAF 1976-1992.
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Old 01-22-2012, 09:01 PM   #5
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But do I have a selector valve on a 1993 f150???? I thought they stopped the valves in 92???
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Old 01-22-2012, 09:32 PM   #6
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There has to be a way to choose the tank to pull fuel from if you have two tanks. Power to the correct pump and sending unit with two one-way check valves or selector valve (which acts as a the one-way check valve).
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Old 01-22-2012, 09:38 PM   #7
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Yes, i have a front and rear selector switch on the dash. I dont see how a check valve can malfunction on a new pump
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Old 01-22-2012, 09:45 PM   #8
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LMC list it as a Fuel Reservoir Assembly bottom left.

http://www.lmctruck.com/icatalog/fd/full.aspx?Page=55
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1985 F150 XLT Lariat 5.8L (351w) HO 4bl 4X2 ext cab. 8 foot bed.
"Some people spend a lifetime wondering if they've made a difference, Marines don't have that problem." President Ronald Regan 1985
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Old 01-22-2012, 09:59 PM   #9
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The check valve keeps one tank from pumping into the other. You select the rear tank that pump and sending unit is powered, as the line builds pressure fuel will follow the path of least resistance, no blockage in the line fuel flows to the other tank, a valve is directional flow control fuel in from port a can only exit port b switch tanks fuel in port d exit port b only no cross flow between tanks.
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"Some people spend a lifetime wondering if they've made a difference, Marines don't have that problem." President Ronald Regan 1985
D.A.V. USAF 1976-1992.
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Old 01-22-2012, 10:01 PM   #10
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Does this truck have injectors? I have and older one with a carb.
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"Some people spend a lifetime wondering if they've made a difference, Marines don't have that problem." President Ronald Regan 1985
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Old 01-22-2012, 10:01 PM
 
 
 
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