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murphfsu
06-22-2006, 08:29 AM
I have a 1993 PS 190 and have noticed that when I am cruising about 36 - 38 and I turn I will loose power -- almost like there is not enough fuel. Most of the time I wakeboard and never notice anything wrong, and the carb seems to be fine. The only hesitation is at high speeds -- I thought it may be the gas but it has been consistent over the summer. Is there any way to determine if it is your fuel pump?

murph

92 190 PS
06-22-2006, 08:47 AM
Friend is having similar issues and he just ordered a new fuel pump. Tried plugs, rotor, filter and a few other things without success. It sounds like high RPM performance problems are usually related to the fuel pump...Below is the description of the common issues related to a fuel pump from skidim's website....

http://www.skidim.com/prodinfo.asp?number=RA080002A

Detailed Description
Carter Fuel Pumps. Watch for high RPM performance problems and/or less than 4 PSI operating pressure and replace when necessary! *This pump can be used on Indmar Ford's with Holley 4160 single feed carbs, order PCM fuel line # 0417 for proper connection. Eliminates the fuel pump filter element.

BrianS
06-22-2006, 09:43 PM
Woah, talk about deja-vu!! I'm having a very similar problem. While cruising at 35+ MPH for a period of time the motor will start to surge. Like someone is pumping the throttle.

At first I thought it was a miss, so I replaced plugs, wires, cap and rotor (they needed it anyway) with no success. After talking with the guys at Skidim I put a new fuel pump in last night. Going to the lake this weekend for a test run. I'll report back next week with the results. I also took some pics of the fuel pump install, and I'll post a HOWTO for replacing it.

Wes
06-23-2006, 10:28 AM
Check your one way valve at the gas tank first. I replaced pump, carb, ignition and found out the valve was fouled with metal shavings. Worked great until you decided to open it up and then it just plugged and ran out of fuel. It acted just like you described Brian. Surging and then just quitting.

murphfsu
06-23-2006, 12:33 PM
Wes -- thanks. I really notice it when I make a sharp turn -- like you said it feels and sounds like someone is pulling back on the throttel or that I am running out of gas.

Let me know how it goes. I plan on buying a new fuel pump as well.

Scott

Wes
06-23-2006, 12:46 PM
It was on my 88 190, and after I fixed the valve it ran perfectly. A lot of work just to find out it was a simple valve cleaning (or replacement) Good Luck

Wes

Brent
06-23-2006, 09:14 PM
Cruised for 20 minutes @ 25mph ,Stopped for a skier to get in the water. tried to start the skier & the engine back fired & hesitated & stalled , tried again & the same thing happened . My Battery started to lose strength & ened up being tow by the Coast guard. The boat has been running great until now. any idea's ,bad fuel, Water in the system, vapor lock, fual pump? :confused:

BrianS
06-25-2006, 08:52 PM
I took the boat out this weekend and no joy, same problem. The filter that was in the old pump looked pretty bad and the replacement has no filter so I was hopefull this would work.

Wes, thanks for the tip!! I was really running out of ideas. Is this valve easy to get to? Do I need to pull the tank?

murphfsu
06-25-2006, 10:23 PM
Brian -- sorry to hear that the pump was not the answer. Let me know if you figure out how to check the valve.

BrianS
07-27-2006, 05:21 PM
Thought I would update this thread since I have solved my problem. Wes, you were right on the money, if you are ever in Southwest Ohio I owe you a pull and a beer.

The check valve at the tank was clogged with small chunks of plastic. I have no idea where they came from. It took me some time to get them cleaned out. Some small pliers and an air compressor definitely helped. I took some pictures for everyone's reference.

First picture is of the tank slid forward so I could get to the valve.
http://bshowalter.no-ip.com/images/mastercraft/fuel_tank_valve/thumbs/img_1922.jpg

Here is the valve. It is the aluminum piece that sticks out the the 90* fitting.
http://bshowalter.no-ip.com/images/mastercraft/fuel_tank_valve/thumbs/img_1934.jpg

BrianS
07-27-2006, 05:24 PM
Here is the valve by itself.
http://bshowalter.no-ip.com/images/mastercraft/fuel_tank_valve/thumbs/img_1924.jpg

Looking into the valve you can see that it is clogged.
http://bshowalter.no-ip.com/images/mastercraft/fuel_tank_valve/thumbs/img_1929.jpg

BrianS
07-27-2006, 05:25 PM
Here is a piece of plastic I pulled out.
http://bshowalter.no-ip.com/images/mastercraft/fuel_tank_valve/thumbs/img_1930.jpg

Got the valve cleaned out, put everything back together and she runs like a champ again!!

Thanks again Wes.

east tx skier
07-27-2006, 05:28 PM
Thanks for the pictures!