Posted by Clint Dixon [74.206.62.210] on Sunday, March 01, 2015 at 14:16:55 :
In Reply to: Re: WDX Fuel sending unit ?? posted by The Dodge Boys [65.78.41.32] on Sunday, March 01, 2015 at 10:26:48 :
I have never owned a military Dodge, only early Power-Wagons from 1946-1951, so I am unaware whether or not any of the military trucks share the same tanks, gauges, or sending units.
The information from the Power-Wagon parts manuals is as follows:
1) 1946 WDX through early 1951 B3PW serial number 83922966: Tank #1189 807 and 2-wire 6-volt sending unit #1188 955.
2) Early 1951 B3PW serial number 83922967 through mid 1953 B3PW serial number 83937527: Tank #1273 825 and single-wire 6-volt sending unit #1274 063.
3) Mid 1953 B3PW serial number 93937528 up to approximately mid 1956 C4PW serial number 83949001: Tank #1504 045 and single-wire 6-volt sending unit #1274 063.
4) Approximately mid 1956 C4PW serial number 83949001 through 1963 WM300 unspecified serial number: Tank #1504 045 and single wire 12-volt sending unit #1566 605.
5) 1963 WM300 unspecified serial number through 1968 WM300 unspecified serial number: Tank #1504 045 and single wire 12-volt sending unit #2448 819.
From this we know that the sending unit (and also the dash gauge) changed in mid early 1951 from a 2-wire thermostatic design to a single wire electromagnetic design. We also know that the single wire electromagnetic sending unit changed sometime in 1956 from 6-volts to 12-volts, and also changed part number again sometime in 1963. Coinciding with the 1951 change in the sending and dash units was a change in the fuel tank. The fuel tank changed part number in 1953 and kept this number through 1968.
I have never owned a truck newer than 1951 that still had the original fuel tank, so I do not know when the change took place from bolt-on sending unit to a twist-lock sending unit. I would guess it took place in 1951 at serial number 83937527 as this is the only place indicated by the books where a change in the sending unit and the fuel tank took place at the same time.
If bolt-on sending units were used after early 1951, I would like to know.
What is interesting is that the VPW catalog lists a new reproduction tank that replaces the old #1189 807 and, with the addition of a new sending unit, also replaces the #1273 825 tank, but the catalog lists no tank to replace the 1956 through 1968 #1504 045, only indicating that the #1273 825 tank can be used through 1971. (Maybe the 1956 #154 045 was a part number change only without any change in actual tank design?) They also list two new replacement single wire sending units (apparently this is the twist lock design) - one to replace the 6-volt #1274 063, and another to replace the 12-volt #2448 810 - but they do not list anything to replace the 1957 through 1963 #1566 605 unit. (Maybe the change in #1566 605 in 1963 to #2448 819 was a part number change only without any change in actual sending unit design?) They also list a new combination 6-volt and 12-volt replacement sending unit that is shown as being a bolt on unit (not twist on)that fits trucks from 1950 back through 1939 and lists the engineering codes for the early military half ton models.
Junior
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