Cummins ISC Electronic Diesel Engines installed in a Thomas School Bus have a few accessibility problems.
Replacing the fuel transfer pump is one component that requires some removal of surrounding parts behind the transversely mounted radiator and charge air cooler.
This photo shows the transmission cooling line, power steering hose and radiator support brace removed.
The fuel transfer pump is mounted at the left rear of the engine block above the starter.
There are five fuel connections at the fuel transfer pump manifold and the wiring bulkhead supplying the engine ECU [electronic control unit]
As noted in the previous post the pump and motor assembly cannot be inter-changed with the old housing.
Here you can see the difference and why leakage is guaranteed since the new rubber formed gasket will not seal properly.
This the only difference from the change-up on design, obviously an improvement from previous problems with leakage.
The larger orifice on the original housing is the output side.
The transmission cooling hose and power steering hose to the fan motor have been re-installed including the radiator to frame support brace.
Removal was required to gain access over top the frame.
This is the best and the quickest way to replace the fuel transfer pump on a Cummins ISC Diesel Engine on a Thomas Pusher School Bus.
School Bus Mechanic on my "Squidoo" Lens