Is the prop clean? I may also be the fuel filters. It sounds like low fuel flow. Put in new filters, and bleed the system. DougSent from my T-Mobile 4G LTE Device -------- Original message --------From: Dave via CnC-List <[email protected]> Date: 9/7/21 18:17 (GMT-08:00) To: [email protected] Cc: [email protected] Subject: Stus-List universal M20 diesel question Evening all. Trying to help a neighbour here with a diesel issue. His engine will rev freely at idle but with the transmission engaged in either forward or reverse, revs increase very slowly and only to 1800-2000 RPM on the tach. (whether tach is accurate or not, RPM under load is much lower than no-load, and RPM increases quite slowly.)We have verified that neither the exhaust system nor the fuel supply to the high pressure pump is obstructed. Air Intake is clear. The speed lever works smoothly to its full travel. The compression release is not engaged. The engine runs a new facet electric fuel pump with plenty of flow.When the engine is running, no fuel returns to the tank via the return line. The return line is not blocked, at least not downstream from the return barb at the injector. I am not sure under what circumstances the fuel should return to the tank in a diesel, as the return occurs after the high pressure pump. All This leads me to suspect a fuel (volume) problem but i am not exactly sure where to look next. I believe all that’s left are injectors and high pressure pump. The high pressure pump has a governor, not sure if that functions by restricting fuel flow. Any thoughts? Many thanks! Dave 33-2 Sent from Mail for Windows
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