Suzuki 150s won't go above idle

Captains Cat · Posted: Sun Aug 19, 2012 8:51 pm Post subject:

Thanks for the idea. The hoses are good grade marine fuel hose, Dr. Bob did it right!

Charlie

thataway · Posted: Sun Aug 19, 2012 10:33 pm Post subject:

Sorry to hear of the problem. What is even more puzzling is that you have been running the boat regularly recently...

Whan I first got the boat there was a bad anti siphon valve. I replaced it. That was causing the same problem, but it would show up as a flat primer bulb. The Racors are before the senders, but the fuel can sit in the senders and cause problems. You have already checked out the lines for water. There didn't seem to be much water in the tank, since not in the racor or in water sep inside the cowl.

I think that you had plugged senders--maybe the turbines were not spinning? I also put Starton in the tank, as well as either Ring free or Seafoam.

BrentB · Posted: Fri Aug 24, 2012 6:58 pm Post subject:

Any update?

I will still buy it Wink

Captains Cat · Posted: Fri Aug 24, 2012 10:40 pm Post subject:

Brent, you can't afford it and I won't sell it!

Removed both fuel flow turbines, now the stbd one runs fine and the port one still exhibits the same problem. Will remove the primer bulbs and see if they are plugged in any way. I suspect a bunch of crud somehow got past the Racors before I changed them. The LP filter on the port engine doesn't fill with fuel which indicates fuel starvation to me. I also treated the fuel with Startron and Blue Stabil the last time (fall of 11) I filled it.

Have new HP and LP filters coming from Wefings along with Yamaha Ring Free which Marc recommends (at a lower than Internet price I might add!). He doesn't recommend Seafoam, says its bad for the O2 sensors.

Will update as I find answers, thanks all!

Charlie

BrentB · Posted: Fri Aug 24, 2012 11:35 pm Post subject:

keep us posted

Captains Cat · Posted: Thu Aug 30, 2012 10:25 am Post subject:

Well, it looks as if my problems are solved (at least the running above idle one). I got new HP and LP filters from Marc at Wefings and decided I'd try a couple more things before I installed them.

I had previously taken out the fuel flow turbines and got some advice that the primer bulbs were not really needed. So, I took the primer bulbs out of both fuel lines and (after making sure they were free of debris and spinning well) reinstalled the fuel flow turbines. Both engines run well now at all speeds. I suspect that the primer bulbs were somehow restricting fuel flow above idle, at least on the Port engine.

Now, the only remaining issue is a pee hole problem on the Starboard engine. I've run three treatments of salt-away through both engines. The upper flush port connects somehow with that pee hole and on the Port engine, water freely flows out of the hole when flushing. On the Starboard engine, no flow no matter what. It doesn't overheat so I suspect some sort of obstruction. According to the manual, that tube connects directly to the block. I've run a wire in about 9" and there is no obstruction that I can find. I had good flow up until about a month ago. Maybe I need FloMax... Rolling Eyes

Next step is to use my air compressor, dial it down to about 20PSI and try blowing it up the hole/tube. If that doesn't work and it's still not overheating, I'll leave it until I haul for an oil change and can get the side cover off. If anyone has any other ideas I could try, please send them on!

Charlie

BrentB · Posted: Thu Aug 30, 2012 1:17 pm Post subject:

Are you running the OBs in the water or using muffs?

Captains Cat · Posted: Thu Aug 30, 2012 5:13 pm Post subject:

When I run them, I do it in the water. When I flush them, it's out of the water through the two flushing ports on the engine. I dont run them while I flush them.

Charlie

potter water · Posted: Fri Aug 31, 2012 4:58 pm Post subject:

You indicated that you are running two completely separate engine systems. Still C-razy has a single fuel control valve that selects right or left tank. The single RACOR input takes fuel from the outlet of the fuel valve and then has two hoses off the RACOR, one to each engine. I'm kinda thinking that I'd like to truly separate the engines, add a second RACOR and really separate the system for true redundancy. But I'd want to be able to cross feed the fuel if needed in an emergency. Does your boat (thread originator) have a cross feed as well so that you can get fuel from either tank to either engine in an emergency? If so, do you have a valve type that does that job?

Captains Cat · Posted: Fri Aug 31, 2012 5:29 pm Post subject:

No Harry, it does not. With two large engines, If I have any kind of trouble with either that makes it unusable, I've always got the other one and I'm kind of a proponent of the KISS principle!

Charlie

potter water · Posted: Fri Aug 31, 2012 5:34 pm Post subject:

Well said. I think I'd like to separate the two fuel systems next spring. I do run both engines all the time, so fuel consumption goes down at the same rate. I also typically fuel both tanks from a common source at the marina or service stations, so bad fuel would likely go into both tanks anyway. KISS has served me well over the years. But my deep space spacecraft experience does make me ponder "block," cross strapped redundancy. But then I'm not spending tax payer money on Still C-razy either.

Captains Cat · Posted: Sat Sep 01, 2012 2:08 pm Post subject:

We're all good to go now! Put about 40psi of air on the telltale tube of the Stbd engine this morning and moved whatever was in there a little bit. Then with about 10" of flexible wire in there either broke it up or pushed it back into the block. "pees" fine now! Thumbs Up

Charlie

localboy · Posted: Sat Sep 01, 2012 7:38 pm Post subject:

Nice... Be gone small blockage!

BrentB · Posted: Sat Sep 01, 2012 7:44 pm Post subject:

great news and good job