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The need for diesel engines to achieve good fuel economy with low exhaust emissions poses a complex development problem with sometimes conflicting requirements. In order for these to be addressed, there is a need for a flexible high performance fuel system. This paper describes a heavy duty in-line fuel pump designed for electronic control. It is configured to fit class 7 and 8 truck engines, and features high injection pressure with full authority variable timing.

A fundamental problem with methanol fueled engines is poor cold startability and high formaldehyde emissions during engine warm-up. Direct injection has the potential to solve these problems. The design and development of an electronically controlled low pressure injector which provides an alternative to high pressure “diesel” type injection is reviewed.