I have a 1990 Ford F150 xlt lariat. replaced fuel pump on rear tank and now gas gets dumped in front tank and overfills out of the gas cap. If I mixed up my fuel lines, is this what would happen? I know there is a return hose headed to the front tank. Front tank has not worked for a while and I am fine with just using the rear tank
You have 2 options
1--- put the fuel return line into the tank you are using
2--- install a balance line between tank 1 and tank 2 so that the fuel back to tank1 is allowed to balance back into tank 2
properly set up the tanks should be connected so that the fuel gauge reads the total fuel in the tanks and there is a need for only one fuel pump
SOURCE: 1990 ford f150 has dual tanks. gas pumps from rear tank to front
See these two threads for more info, I've heard of this happening before, in fact at one time there was a recall from Ford regarding this exact issue - http://www.fordf150.net/forums/viewtopic.php?p=227833 - http://www.fordf150.net/forums/viewtopic.php?p=46861
SOURCE: How do I remmove secondary fuel tank which is leaking?
there should be two straps holding the tank in place,,,,if you remove them the tank should drop down to where you can disconnect the feeder hose and go from there
SOURCE: Ford F150 1990 truck - Gas was leaking from the
You definately need to get the truck serviced soon. To just guess at it, the balance pump isnt shutting down. The guage may not connected or moving freely.
SOURCE: 1987 fuel level guage issue
the gas is regulated from the switching valve you control off the dash. Check the valve to hear it switch
have a friend help you do this. it will be located under the truck between the two tanks. You may have a faultly valve or switch rattling inside changing the tanks setting also while driving which will be hard to tell
SOURCE: 1989 Ford F150 Lariat Dual tanks...rear tank is
Thet don't have a switching valve,the switch just turns on one pump or the other.
Ford dealer has a fix ,a short piece of line with a one way valve,just snaps on to both lines .simple install,just buy the part,they will know what you are talking about at the parts counter,
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