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After 2 years of trouble free use, my 1981 27' Catalina with the Universal 5411 diesel is having a problem. The engine starts well and will rev up. When I throtle back and put the prop in gear the engine will not reach full power. It seems to run at about 1/3 to 1/2 power made only 4 MPH from ramp to marina and took 5 minutes to get to that speed. What do I need to do?


I bleed the fuel system. At the injector one line (closest to front) was delivering a pulse of fuel. Rear line was delivering a steady stream. All else seems to be OK. Some fuel could be 2 years (or more old) Stabilizer was added 07 and 08 winter.

Gary
 

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If the engine runs, bleeding the fuel system is not necessary. Since the issue seems to be you are down on power, my list of possible problems would include: plugged fuel filter(s), bad fuel, and bad injectors (rebuild or replace).
 

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Or prop could be badly fouled.
 
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