Volvo 2040D Problem

[Marleetet]

Two days ago when I started my engines after sailing in calm conditions for awhile, I was unable to get the starboard engine past 1000 rpm (in gear or in neutral). I suspected fuel filters and went below to change the pre and the main. Prefilter was dirty and needed changing-the main from what I could see looked cleaned: but I changed that one as well. I purged the air from the system and fired up the engines. Worked well. For the next hour we motored, with me changing rpm's all the way up to WOT for a short try. Changed the port engine filters. Yesterday we motored again, a short distance and all was well. This morning starboard engine again would not get above 900 rpm. Looked at starboard filters-still new looking-changed anyway. Purged and fired up the engine. Still won't get over 900 rpm.

I checked all the fuel lines for blockage and found none. The starboard engine is making a slightly different sound than the port: almost like purr/roar every few seconds. The port just purrs.

Any suggestions?

Mark

[DeepFrz]

Sounds like fuel starvation to me in the starboard engine.

[kjames]

Mark, any chance there's a breather problem at the fuel tank?

[Marleetet]

kjames-

When I pulled the fuel hose from the fuel tank to the Racor- I got enough fuel flow to easily fill a 12 oz. can in 30 seconds. Same after the Racor at the engine fuel filter.

MArk

[DeepFrz]

Did you remove the pickup tube from the tank. Sometimes they have screens on them that need to be removed and trashed. I once had a chunk of black grunge plug the fuel line at the 90 deg. bend at the top of the fuel tank.

[Marleetet]

Deepfrz-

No I haven't- but I am getting plenty of flow out of the fuel line back at the razor and beyond. Again, I would guess the flow would be good enough to fill up a coke can in 30 secs -maybe less.

Mark

[kjames]

well "clutching at straws" now, but what about a fouled prop? Affecting my boat ATM - doubtful for you though cos I can get well above 900rpm. It's just that there was a thread on CF a week or 2 ago (yanmar I think) with some comment about how surprising the affect of a fouled prop can be. Good luck

[atoll]

check the engine "stop " lever is able to return to the "run position.
a corroded cable or sticky/faulty solenoid valve can cause the engine to start and run,but will not give any revs above idle.

[Marleetet]

Solved the problem- DeepFrz was correct. Partially blocked supply tube. Thanks for the ideas.

Mark

[DeepFrz]

Great that you solved it...