This document was originally released between 1994 and 2001. It has been added to QSOL for informational purposes
This document provides information required to convert a fuel system that was originally configured for a PT (type H) fuel pump to a PT (type G) fuel pump. This topic applies to KV engines. For information purposes, PT (type G) to PT (type G) upgrade information has been included.
The PT (type H) fuel pump is obsolete, and there are no service parts available. If a PT (type H) fuel pump requires service, it must be replaced with a PT (type G) pump. Refer to the PT (type H) to PT (type G) Fuel Pump Conversion section of this topic.
Although there is not an exhaustive listing of current codes as replacements for all of the PT (type H) codes, service codes can be developed on request thru Daventry Engine Plant Fuel Systems for the old codes that do not have a service replacement listed. Requested service replacement codes require time to resolve. Turn around times will depend on the complexity of the request, as well as budget and schedule restraints.
It is possible to upgrade an existing PT (type G) system to a more current PT (type G) system. This may be necessary if service parts for an old PT (type G) type pump are not available. For informaation purposes, PT (type G) to PT (type G) upgrade information has been included in this service parts topic.
The PT (type H) and PT (type G) fuel code upgrades to the latest available replacement fuel codes listed in this service parts topic can also be found in the Fuel Pump PT (type G) Calibration Value Bulletins. However, the plumbing change information shwon in Table 2 , Fuel Pump Part Numbe, Injector part number, and CPL's are not always listed.
PT (type H) to PT (type G) Fuel Pump Conversion
The PT (type H) to PT (type G) conversion requires:
Engine and fuel system component compatibility (control parts list (CPL) verification).
Reduced drain flow (RDF) injectors.
Fuel line and/or air fuel control (AFC) line plumbing change.
PT (type G) fuel pump.
Fuel pump calibration.
Engine and Fuel System Component Compatibility. - When converting from the PT (type H) to PT (type G) configureation, the engine performance parts must be compatible with the replacement fuel pump code. Compatibility can be verified using the control parts list (CPL) for that engine. Compare the CPL data for the PT (type H) pump with its associated PT (type G) replacement pump CPL data. In order for the conversation to be successful, the configurations must be identified.
Some engine changes may need to be incorporated when using the indentified replacements. For example, non-top stop injectors or hydraulic variable timing may have been changed to stepped timing control (STC), or there may be an AFC replacement for an old non-AFC code, or check valves, esternal governors added or deleted. These differences can be verified using the CPL and fuel codes.
All replacement PT (type G) fuel pumps include the external bleed type gear pump.
