Carver 400 MY engine RPM issue

[hausherrs]

Engines: Cursader 454 XLi

This past weekend I took the family out into the bay and the stbd engine wouldnt go over 2500 RPM when I had the port at 3000. I backed the port down to 2500 and the stbd would follow it down regardless of throttle. When I throttle up the stbd it would drop 200 rpm.

No smoke or strange noises. Temps and oil pressure were normal.

I have a set of fuel filters I need to put on. And im planning on sending off the injectors for cleaning.

Any ideas?

Thanks,

Steven

[g36]

I have 454 xlis on my carver 405. You have 3 fuel filters per each engine. The first is the oberg (ufo) which is a screen and can be opened and cleaned. When i notice any rpm issues I look here first I do have some junk in my tank and have to clean this a couple or so times a year. I would check it and clean it. Next is the water seperator and then the inline filter by the tbi it may be a good idea to change them I f you don't know the last time they were done but hold off on sending out the injectors. The oberg could easily be the culprit and once cleaned I would test drive it before doing any other filter.

[g36]

In case you didn't already know the oberg is black and a pancake or ufo shape with a bolt running through it. Put a basin under it to catch the gas and open it by loosing the bolt. It seperates in 2 pieces Remove the mesh screen and clean the screen then reinstall it

[Viper]

This is what g36 is talking about:

Complete assembly:

https://www.marinepartssource.com/newdetails.asp?pnumber=CRURA077013&mfg=crusader&mcat1=17&mcat2=0&mcat3=0&mfgcategory=Fuel+Filters&mfgno=RA077013%20%20%20%20&desc=110+Micron+Fuel+Filter

Filter:

https://www.marinepartssource.com/newdetails.asp?pnumber=CRUR077013&mfg=crusader&mcat1=17&mcat2=0&mcat3=0&mfgcategory=Fuel+Filters&mfgno=R077013%20%20%20%20%20&desc=Fuel+Filter+Screen

[dsolo]

Make sure gas valves are in the off position. I know from experience.

[mjk1040]

So Viper, you think Crusader or Carver anticipated crap from the fuel tanks in these models? And what filter is at the throttle body? Mike

[g36]

So. I'm not viper but here is the filter at the throttle body
https://www.amazon.com/gp/aw/d/B002XKFM ... PDKIKX0DER

[hausherrs]

Thanks for the info guys.

Ill pull that filter apart this evening. I have a set of those pricy TB filters. They just need to be installed.

One thing worth mentioning is that engine RPM seems to get lower and lower every time I take it out. Junk in the filter would make sense.

Thanks,

Steven

[Viper]

Source of the post ...you think Crusader or Carver anticipated crap from the fuel tanks in these models?....

This was a Crusader thing. Can't remember the recommended service interval off hand but I check them whenever I preform fuel service on a Crusader that has them. I find if they have never been serviced, they can get so bad that I don't even bother cleaning them and replace instead. After that, if serviced regularly, a cleaning is all they need. Crusader recommends they be checked within several hours run time when the vessel is new as it's likely to trap debris from a new tank/vessel build. But I suspect that's rarely done from what I've seen, which is unfortunate as it's the first line of defense in the system if memory serves me correctly.

[hausherrs]

Here are a couple pictures. A good amount of blockage...

20170220_185812.jpg

20170220_185817.jpg