R25 stalls when trolling

[DMR]

While trolling today my R25 (Cummins 130 hp, 10 years old) stalled 3 times. Restarted easily. Trolling at RPM 700. When running at higher RPM no problem. On SmartCraft got a "Low Fuel Pressure" alarm. This has never happened before, but I do not usually troll at 700 RPM for several hours. Can anyone help diagnose the problem?

 

[doke01]

Did you check the oil level? Very low oil level's can cause this.

 

[daveo]

Had similar problem. Changed both fuel filters and problem was gone.

 

[linedoctor]

I had a similar problem with my R29 and it ended up being a clogged fuel filter even though I was up to date on filter maintenance.

I paid a diesel mechanic to come out and he diagnosed it in minutes. I can’t recall if it was the primary or secondary filter but he replaced them both and all was fine afterwards.

 

[DMR]

Oil level is fine. I will first try changing the fuel filters. Thanks.

 

[knotflying]

Not sure if your vintage boat has it, but there may also be a screen filter on the fuel pickup in the tank. It is not necessay to have for diesel fuel. It is a pain to remove so after you replace your filters if the problem persists you may want to check that out.

 

[DMR]

The primary fuel filter (Racor 12T) was a black clogged mess. After changing it it took awhile to bleed the system. But now it works great at idel and trolling speed. Thanks for everyone's advice.