My 1988 F150 Dual tank issue.
02-11-2011, 02:30 PM
#1
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My 1988 F150 Dual tank issue.
My 1988 F150 351 ci, EFI, auto-trans, 4X4 w/dual tanks is driving me crazy. Gas constantly migrates from front to rear and rear to front. I never know where it is going to be next. Can't figure this one out!!! Also at 8 mpg I can barley afford to drive it to the local trash dump! I bought it as a fixer up and thank goodness I have other transportation. Can someone give me some suggestions?
02-11-2011, 02:36 PM
#2
No Pain, No Pain!
My 1988 F150 351 ci, EFI, auto-trans, 4X4 w/dual tanks is driving me crazy. Gas constantly migrates from front to rear and rear to front. I never know where it is going to be next. Can't figure this one out!!! Also at 8 mpg I can barley afford to drive it to the local trash dump! I bought it as a fixer up and thank goodness I have other transportation. Can someone give me some suggestions?
Good luck!
02-11-2011, 10:45 PM
#4
Senior Member
Also may be the check valve inside the fuel pumps. My truck is doin the same thing right now but I elimated my rear tank so it just leaks. Gettin it takin care of right now. Mine is a 92 so not sure if its the same issues. There was a recall not sure how far back it goes for the check valve tho
02-12-2011, 02:21 AM
#5
Senior Member
An 88 won’t have the same setup as a 92. It has a low pressure pump in each tank with a high pressure pump on the frame along with a selector valve. A 92 has a high pressure pump in the tanks with built in check valves and no selector valve just the selector switch on the dash.
02-12-2011, 03:05 AM
#6
Senior Member
Originally Posted by Nitehawkjr
An 88 won't have the same setup as a 92. It has a low pressure pump in each tank with a high pressure pump on the frame along with a selector valve. A 92 has a high pressure pump in the tanks with built in check valves and no selector valve just the selector switch on the dash.