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I think I have a theory and I think I know what the issue is.
This is a 1977. The REAR tank above the spare tire is the MAIN tank. The MIDSHIP tank must be 'auxiliary'. This is why the gauge works when when you short the pin to ground with the switch on AUX. Since the sender is showing high resistance, the guage is reading empty, and thus why when I plug in the midship tanke, even though its full, it shows empty. The sender is the issue here.
However, on my truck, to 'get it to run'. A mechanic bypassed the tank valve and simply plugged the hose to the end straight into the midship tank and unplugged the valve. So, the truck is drawing from midship, no matter what the switch and valve say. That way they didnt have to replace both tanks and senders or explain to an old lady which is main and what is what. Fill up the midship tank and drive. Even if it says empty.
I'm going to test this out later.
One thing that would be helpful is the 'routing' of the hoses on the FACTORY tank selector valve. Anyone have that schematic for a 1977?
About as schematic and I can get at work. The dvrs side of the valve goes from rubber to steel and runs up to the fuel pump (where it goes back to rubber) too connects to the fuel pump. The bottom connection on the valve goes from rubber to steel and up the frame rail to the side saddle tank.
They put a rubber hose between the midship tank and the fuel pump, so it's only drawing from that tank no matter what. I think this is the issue. I'll pump the fuel out of midship and replace or check out that sender since its easy to get to.
I need a new sender for both tanks. Does anyone know if they are the same? I wouldn't think so, but there is only one sender listed everywhere.
Pretty sure NO they are not the same, since the side tank is narrower than the aft tank. Some of the business phone numbers are old and they might be shut down.
Fuel sender 76-up F100-350 >s/n C00,000
Use with aft axle steel tank, includes gasket
D7TZ-9275-D
Bob Hoover Ford-Mercury, Vienna, IL (618) 658-9218
Brighton Ford, Brighton, MI (800) 336-3305
Beau Townsend Ford, Vandalia, OH (937) 898-5841
Own Ford, Jarratt, VA (434) 535-8515
Vintage Fords, Beaver Dam, WI (877) 846-8243
.................................................. .................................................. ......... Mid ship fuel tank support cradle part # D7TZ9K134A - Reinforcement Assy. And more info in it here. http://www.ford-trucks.com/forums/86...ank-mount.html
And mid ship sending unit info D9TZ-9275-A(replaced D7TZ-9275-H& D8TZ-9275-D) .. Fuel Sending Unit-Use w/Mid-Ship Plastic Fuel Tank / Includes float, filter screen and gasket / Obsolete Marked: D8TF-AA, AB, AC, DA; D9TF-AA.
Applications: 1977 F250 Regular Cab 4WD from serial number Y20,001 (not a High Boy) / 1978/79 F150/250 4WD Regular Cab / 1979 F350 4WD Regular Cab. D9TZ-9275-A= GREEN SALES CO. in Cincinnati OH has 800-543-4959.
NOS PARTS LTD in Waxahachie TX has 972-937-2201. BOB ALLEN FORD in Overland Park KS has 800-676-0675. COLLECTORS AUTO SUPPLY in Oroville WA = 800-414-4462 (only number listed).
----------------------------------------------------------------------------------- D7TZ-9275-H= ANTIQUE AUTO SUPPLY in Arlington TX = 817-275-2381.
WESLEY OBSOLETE PARTS in Liberty KY = 606-787-5293.
GREEN SALES CO. in Cincinnati OH = 800-543-4959 / 513-731-3304.
------------------------------------------------------------------------ D8TZ-9275-D= JST AUTOMOTIVE
GREEN SALES CO.
WESLEY OBSOLETE PARTS
AFAIK...D9TZ-9275-A is the correct one for 1979 F350 4wd regular cab midship tank.
Reread post number 11 and number 12. And don’t worry about what the name of each tank is.
Ford changed over the years.
According to Rich’s diagram, if you read the text, the side/midship tank IS the main tank. Not the other way around like I think you are calling it.
So again, don’t worry about what the switch says. Just worry about what you know.
That the midship tank has gas.
The midship tank is the only one connected.
That gauge reads full when you ground that tank’s sending unit wire.
Sounds to me like you have a bad sending unit in your midship tank. Maybe the float deteriorated. Maybe the rheostat has failed. Maybe something else went wrong.
They do get old and fail.
Sorry, maybe I have what you’re saying backwards again. That’s why I hate responding by my phone. I can’t review the previous posts while I’m typing.
But what I said earlier still holds true. Ford changed which tank they called “Main” and which tank they called “Aux” over the years.
So again, don’t worry about what it says on the label. Just what you know.
Sorry, maybe I have what you’re saying backwards again. That’s why I hate responding by my phone. I can’t review the previous posts while I’m typing.
But what I said earlier still holds true. Ford changed which tank they called “Main” and which tank they called “Aux” over the years.
So again, don’t worry about what it says on the label. Just what you know.
right. My testing shows that the midship sender is showing high resistance which corresponds to empty. And the wire will sweep to full when grounded but only on aux setting. As such, the midship tank on this truck is called AUX and the sender is no good or the float has a hole.
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