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Publication Title | Pressure Regulator Replacement – Model C30 Liquid Fuel

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Telephone: (818) 734-5300 • Facsimile: (818) 734-5320 • Website:

Service Bulletin SB0050

Date: From: Subject:

February 2003

Capstone Technical Support

Pressure Regulator Replacement – Model C30 Liquid Fuel

Systems Affected

All Model C30 MicroTurbines equipped with an Enhanced Liquid Fuel System (also known as Enhanced Liquid Operating Range or “ELOR”) Boost Pump and Filter assemblies. The serial numbers of new builds known to be affected are: 2568-2570, 2573-2577, 2593, 2594, 2633, 2634, 2637-2641, 2649, 2654, 2655, 2660, 2661 and 2680. ELOR and HELOR retrofit kits 513883, 514935, 514936 and 514541 are also affected by this change.

Description of Problem

The Pressure Regulator currently installed on ELOR upgrades was found to be suspect for leakage through the body of the cap housing. This leakage occurs at the gasket interface between the regulator and cap housing. This small fuel leakage may prevent the filter assembly from performing as intended, as well as requiring occasional fuel cleanup.

Cap Housing

Gasket Interface

Regulator Housing

Drain Plug

Pressure Regulator Assembly (513771)

As a recommended solution, Capstone is providing a kit containing the remanufactured pressure regulator, fittings, and flex hose. The flex hose (514083) is intended as a replacement part for earlier kits shipped with a rigid tube (513621).

450015-001 Rev A (February 2003) Page 1 of 4 SB0050

This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.

Replacement Kit Parts

Part Number

Pressure Regulator Assembly


Flex Hose, Boost Pump Assembly


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