there is no fuel pressure codes for a STOCK OEM 496

There is no cool fuel codes either but there is water pressure and that parameter and fault code(s)

I have all the scan tools and all the stuff to even test the PCM and the injectors along with fixing any of that if need to be as well.

As stated earlier if you are in Texas BUP is THE man to go to PERIOD. I'm out of state (Oregon) and have used him myself. He has helped me tremendously and went above and beyond to get me and my family back on the water a few times. Very honest and cool guy and great to work with on all levels. I highly recommend him especially if you are in Texas you are lucky!

Bup and Offshore community, thanks! great info here and I will follow up with BUP. The rain here in Texas has the lake level very high, so access to my boat is restricted for now. Once we get access back and power on the dock, I can have BUP come out and start the diagnostics. The fuel valve and pressure comments are very helpful, I was not aware of these issues on this boat. As for the injectors, I do use Lucas brand injector cleaner at each tank fill up. I did this with my last boat and the injectors even at 400 hours were tested and found to be working quite well. So hopefully this is just something related to the fuel delivery.

Again, thanks to this great community!

-j

Thanks for the all of the tips. The anti-siphon valve makes a lot of sense to me as both engine suffer the same performance loss at the same time. I will check that as soon as the lake levels permit. The drives do trim up and down, but the boat is very sensitive to even the smallest trim angle. So I dont trim them out very far at all. The exhaust is through the mufflers then through the side exits. I'll have to see what it takes to check the mufflers for blockage.

As for the 496's, I dont want to throw any real money at them except to get them running as best as possible for stock. I can save my pennies for a repower that way.

Thanks to everyone's kind and helpful posts!
-j

Since you have the Muffler box through the side of the boat id say your fine there. Most likely take off those siphon valves and check to make sure both fuel pumps are working properly. High and low pump on that cool fuel set up. Also pull those injectors and have them cleaned.

And I can test, flow test and clean your fuel injectors. I have all the machines to do so. This coming Jan of 2019 will be 10 years of that service I have provided in the marine industry.

The rain really for the past 2 months has basically stopped many boaters in the area, but for some it has been a break for them to bring their boats in and get serviced and or ahead on the maintenance. Anyways you have my info.

It would be good if you gave me your ENGINE SERIAL numbers so I can look up the past history and anything outstanding with recalls , service bulletins, warranty claims and so forth. You can OSO PM me those if you wish. THANKS

I have a 1996 Wellcraft Scarab P-29, and BUP was able to diagnose some engine issues due to dirty/darn near clogged fuel injectors as well as bad fuel lines and particles in the gas tank. It is actually all linked to each other.

I didn't realize the shelf life of fuel lines, but if your fuel lines are stock from 02, then you are probably pushing fuel line rubber particles directly into your fuel injectors which is causing those to clog and result in some power loss. If there are any particles in your gas tank from the 16 years of use on that boat, then those are clogging your injectors as well.

Once again, I cannot stress how important it is to listen to BUP. I am outside of Chicago, and he (being in Texas) is my #1 go to guy. It is pretty dang difficult to find anyone that you can trust in the marine industry anymore. He will save you money in the long run.

It seems that BUP reputation is well earned! I'm glad this forum was able to help. Hopefully, I can get these 496's to run well enough and long enough for me to re-power with something a bit more fun!

Thanks!
-j