Fuel Pump Interchange
Additional pump information will be added as time permits.
The search for suitable fuel pump replacements has been an issue for a number of years as we move farther away from the ‘good-ol-days’ of easy parts supply.
The DeSoto may be the simplest of replacements to deal with; any LA pump is a virtual one-for-one interchange in terms of the pump arm and actuation. The physical appearance will vary greatly from the OEM and will not gain favour if you are dealing with a restoration. Additionally, the location/orientation of inlet/outlet, as well as the size of the inlet/outlet may also be a consideration. We have compared the early front cover to the later 341 style cover and the pumps mount in identical locations.
We have used a 291 front for the following photos.
Verified early style pump from 341 core engine. Note shape and position of actuating arm.
Verified early style pump from 341 core engine. Note shape and position of actuating arm. The eccentric wear spot is shown by the white paint dot.
Verified early style pump from 330 core engine. Note shape and position of actuating arm.
Verified early style pump from 330 core engine. Note shape and position of actuating arm. On this pump, the wear mark is indicated at the red paint dot
This fuel pump is from a 1972 340 core engine. All LA pumps will be of similar design and operation.
Note that the arm is in yet a different position but the ‘sweet spot’ where the eccentric rubs is in the same location.
The stamped tin cover is used on Dodge and 55-58 Chrysler engines. The covers are the same except for the location or absence of the timing pointer. This particular cover is from a 1955-331 Hemi.
1955-331 tin cover with oem pump. The contact patch is noted.
1955-331 tin cover with LA pump. The contact patch is noted.
1955-331 tin cover with both arm locations and contact patch shown.
1955-331 tin cover with LA pump and ½” spacer. The sweet spot is not exact but may be close enough to work ok.
Increasing the spacer thickness to 11/16″ provides a better location for the sweet spot alignment.