Dual tank valve
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Joined: Apr 2004
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From: NJ where fun comes to die
Dual tank valve
Hi. I'm not sure if I am in the right forum or not. I have a 90 E350 with dual tanks. Where does the power come from for the valve under the truck? Is it a fuse or relay or ? The book does not say if it is a fuse. It won't switch from back to front. I put in a new switch under the dash, but it did not help. The gauge reads the rear tank always. Thank you.
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Joined: Apr 2002
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Hello, I had to replace that valve under the truck on my dual tank F150 4.9l. I think when you flip the switch on the dash board the fuel pump in that tank starts pumping to build pressure and the other tank pump shuts off. The valve with four lines coming out of it with the black bowl on the bottom has a diaphram in it that reacts to the pressure flow from the two tanks. Somebody else said they took theirs appart and cleaned it but becareful of how you do it because it has a lot of small parts in it.
I took mine off and appart to clean it but while cleaning out I noticed some small parts had fallen out and I had no clue as where they came from or how to get them back in there. So off I was to the dealer. Eighty bucks later the two tanks were switching fine.
Check to make sure thought that it is not one of your intank pumps gone bad first before you run out and buy the valve
Jim
I took mine off and appart to clean it but while cleaning out I noticed some small parts had fallen out and I had no clue as where they came from or how to get them back in there. So off I was to the dealer. Eighty bucks later the two tanks were switching fine.
Check to make sure thought that it is not one of your intank pumps gone bad first before you run out and buy the valve
Jim
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From: NJ where fun comes to die
I don't think it is making the switch. I don't hear anything when I move the switch under the dash, and the gauge only reads the fuel in the rear tank. Nothing is switching, that's why I thought it might be a power problem, but I don't know where it gets power from.
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From: NJ where fun comes to die
No, I can only run off the rear tank. And both positions on the under dash switch only show the amount of fuel in the rear. I cannot read the front or run off the front.
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Joined: Oct 2004
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From: Beaver, Ohio
there is no power that run the valve like said before. it is controled by fuel pressure from each pump. as for the gauge it is seperate in the switch also. sounds like you got a bad switch. use a ohms meter to see if it is switching internally.
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cdrgrve1969
1973 - 1979 F-100 & Larger F-Series Trucks
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Sep 7, 2004 09:20 PM
