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dual tanks, rear syphoning gas into front tank

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Old 01-16-2018, 12:11 PM
birdsgarage birdsgarage is offline
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dual tanks, rear syphoning gas into front tank

I have a '86 F150 5.0 efi with dual tanks. The rear tank always fills the front overnight.
The pump in both tanks work but I only have to run off the front because of the syphoning. Lately I have been smelling gas but don't see any. Could a E6TZ9K044A fix this issue?
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Old 01-16-2018, 09:30 PM
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Did you get that number from the other post?
If so and you have the same year truck and fuel set up then I would say maybe but that is the switching valve and the tanks filling would be bad check valves at/in the pumps.
Dave ----
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Old 01-16-2018, 10:25 PM
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dual tanks = rear syphon to front

Thanks Dave and Vjsimone,
So if I can switch my tanks and they work properly, then the E6TZ9K044A (switching unit) is not the problem. I will
consider pulling the bed and replacing the in tank fuel pumps and whatever needs fixed. Until then, I will only use
the front tank. I saw reference to another part # on here, started with F0, can't find it now but was used for a single tank.

I worked at FOMOCO for several years and do recognize some part #'s. fyi, in the E6TZ9K044A, the first character "E"
stands for 1980 and the "6" is the second number of the decade - hence E6 is 1986 and the first year (supposedly) that
the part was built, it could be used in later years but the part # wouldn't change. So F0 would be 1990. the first letter
"B" was 1950, "C" was 1960, "D" was 1970, etc. Not sure what happened after 2000. Hope this helps and thanks
again for the help.
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Old 01-17-2018, 09:51 AM
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The switch does have a failure mode where it will pump from one tank and return to the other tank. I bet that is what it's doing, probably not siphoning on it's own overnight.

If you look at the valve it has six lines, supply and return from each tank, and a supply and return to the engine.
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Old 01-17-2018, 03:26 PM
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Are we talking the same part? E6TZ9K044A
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Old 01-17-2018, 06:03 PM
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The above looks like a single tank unit with a filter in the bottom of it. My single tank 86 ranger has one on it like the above.

They make them with 6 connections for switching the dual tanks. Does yours look like the picture below?

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Old 01-17-2018, 07:21 PM
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yes, it sure looks like it. It's cold out but slipped under the truck and took a couple of pictures. there are 6 in/out fittings
trying to make out the part #
It does have the filter on the bottom, I have changed it out on numerous occasions. Do you have a complete part # for this? Thanks
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Old 01-18-2018, 01:05 AM
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do be ever so careful pulling the nylon fuel lines when changing out this unit.
they get brittle and disintegrate, making you wish you had your original problem back
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Old 01-18-2018, 10:34 AM
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thanks, I've been wondering about that
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Old 01-18-2018, 01:39 PM
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Old 01-19-2018, 06:32 PM
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I see where there is a F1UZ-9B263-B available and it has 6 ports. No one can seem to answer if it has the cartridge filter on the bottom like mine does. If it does not have a cartridge filter but somewhere I saw a reference to charcoal.. Would I need to figure out a way
to put an inline filter in front of this fuel reservoir? Thanks everyone.
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Old 01-19-2018, 08:08 PM
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In this description on ebay, they say it does not include the filter. So it must take one in the bottom like the original.

https://www.ebay.com/itm/OEM-F1UZ-9B...-/131947614919
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