Rear Tank filling up front
#16
07-14-2015, 08:33 AM
If the new pump (FDM) does not work check the selector switch on the dash.
The FDM (Fuel Delivery Module):
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#17
07-14-2015, 10:18 AM
#18
11-14-2017, 03:19 AM
Cross-Country
#19
11-15-2017, 07:21 AM
Tuned
Check valves used to be available from Ford. Solved the problem on both my 89 and my 95 F250s, 4/truck and the pumps are still going strong. The 89's approaching 500,000miles. Parts vendors dealing with NLA parts should have these things since they were used in Fords recall. That's when I got mine
#20
11-04-2018, 10:26 AM
New User
same issue but with a 1997 F350 SRW 7.3.
To fix the fuel transfer problem you have to replace the fuel delivery module in the front tank, and if you want to run just a rear tank you need to plug both fuel lines at the front tank. Plugs can be fabricated from common bolts that will insert into the fuel lines and be retained buy the factory clips, with this you won't have any leaks and can return the truck to a dual tank system at some point if so desired. You will probably need to at least partially lower the front tank to detatch the fuel lines so you might as well remove the tank if you go that far.. it's often easier to just cut the bolts holding the straps in place.
#21
11-04-2018, 10:29 AM
New User
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#22
05-01-2019, 02:37 PM
Reviving this thread: I found this fuel line repair kit online: https://www.summitracing.com/parts/rnb-800-159/reviews/
How would one go about blocking off the front fuel tank for the time being? Would I just need to cut the return and supply lines, add some fuel hose at the end and plug it with a bolt? Would that hold up to the pressure the fuel system is under?
How would one go about blocking off the front fuel tank for the time being? Would I just need to cut the return and supply lines, add some fuel hose at the end and plug it with a bolt? Would that hold up to the pressure the fuel system is under?
#23
05-18-2019, 02:56 PM
I bought a new 17 gallon front tank with the FDM in it came with straps from autozone for about $180 for my 96 f150. They price matched rock auto's price. It's the same one but Rockauto is only 2 yrs warranty while AZ is lifetime only takes an hour to to put in if you have basic knowledge. Only need a couple wrenches, sockets and the quick disconnect for fords which you can loaner from AZ. My tank a strap broke and was leaking so we didn't use it anymore. It was getting fuel from the rear pump so I just replaced it. Not to mention im not quite ready to give up on the old girl since she runs so good
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