View Full Version : Injector Flow Report

11-21-2012, 09:02 PM
Got them back today. Here is the results


Filter Screens for Injectors and High Pressure Pump - 10 total at 10 bucks each. My fuel systems has 14 fuel filters in the system from boat to injectors.


High pressure Pump: That little brass ring is the head of that little filter


11-22-2012, 05:18 AM
The Cat ought to run like a scalded dog now Jim.

11-22-2012, 05:19 AM
Interesting that #4 on low speed went down after cleaning. Why?
Mike c

11-22-2012, 05:49 AM
Interesting that #4 on low speed went down after cleaning. Why?
Mike c

Not sure Mike. I found that interesting too. I think that 3 ml drop isn't going to be as bad as 2 of them not working at all lol. Whats also interesting is that I bought the boat in may of 2007. It blew up because of a stuck piston lean condition in feb of 2010 (about 33 months). I started having trouble again now in Nov of 2012 (about 31 months). I average about 125 to 150 hours of engine hours per year so it appears that about every 250 / 300 hours give or take a few the fuel system starts getting clogged up. Ethanol no doubt. But Larry is right. That cat should run like its tail is on fire! My son and grandsons are using it today on Anna. I will know in a couple of hours if I did my job right lol.

My visual inspection of the filters and injectors was negative, i.e. no carbon build up, rust, no debris or foreign objects, dirt, etc was present. Just a lot of varnish. Maybe some sea foam or other good cleaner will help keep the varnish down.

11-22-2012, 06:20 AM
Another good clue: The fuel bulb on my boat would never get hard no matter how much I pumped it. When researching my fuel problem I found another good bit of info on the probable cause for that condition i.e. the low pressure fuel pumps that pull the fuel from the boats fuel cells to the motor were starting to get weak / worn (800 + hours on these pumps). I changed them and now the fuel bulb does get hard after pumping it up. Just FYI.

I would think that no matter what brand of motor on your rig fuel varnish is going to cause trouble at some point. I am going to do some research on finding a good cleaner and a fuel brand that has good cleaner additives included. Maybe Shell gas. Dont know yet. Any Chemical engineers out there reading this lol.

EDIT: Did some reading; Chevron! Also Fuel without E-10 = > Varnish....Fuel with E-10 = > Gum....

11-22-2012, 08:21 PM
My son and grandsons used the boat today at Anna. He said it runs like a cat at a dog convention lol. Good deal. I will be able to get out on Sun to see for myself lol.

11-26-2012, 06:38 AM
I seen you friday jim and the cat was rolling!
looked and sounded good as you flew buy me at the splits...lmao

11-26-2012, 10:13 AM
Interesting that #4 on low speed went down after cleaning. Why?
Mike c

If I had to guess, it was probably the only "clean" one and after cleaning, with the others now pushing fuel, the overall pressure dropped for the one....