Fuel Delivery Issues

[Capt. Bob]

Dan,
Does your new filter look like this one?

http://www.moellermarine.com/aftermarke ... l_filters/

Does your new pickup look like the one # 033500-24 toward the bottom of the page?

http://www.moellermarine.com/aftermarke ... ries-noul/

If so, a quick check (though I see no reference to an anti siphon valve) would be to blow through the bottom of the plastic tube (pickup). Resistance would indicate some type of back flow prevention (AS).
Also, my opinion would to be to cut off the bottom of the 24" tube so that it rests about 1/2"-3/4" above the tank bottom. 1" would not hurt and would allow for some margin of error pertaining to crap and water collecting on the tank bottom being sucked into the line. Yes, your 10 micron filter will provide protection from most of this crap, most of the time.

From what you state, your problem lies within your existing setup. Replacing the pick up, fuel line and adding the filter should help but....
You may be picking up contamination from the bottom of your tank.

As BA asked, it doesn't sound like you have replaced the 90 at the tank (since you haven't trimmed the tube).

[daniel123]

I have not yet replaced anything, but plan to replace then entire fuel line and filter next week. The fuel tank pick-up fitting Moeller sent does not have an AS valve, which I believe is good. Now I must decide whether or not to keep the manual shut-off valve that connects to it and came stock with the Moeller fuel tank AS used with my boat.  I learned that yesterday, when Awl sent me Moeller schematics of the tanks used in Ospreys 20s showing same.

[daniel123]

And yes, Bob, both those look like what I got from Moeller. I got the filter set-up with the see through bottom and a composite top since I will use the boat in salt once a year, and they sent me the pick up fitting without an AS with the 24 inch tube.

Good idea about cutting that tube a little short so that it won't suck gunk off the bottom of the tank -- which I bet has not ever been cleaned. While I'm changing the fitting, is it worthwhile to drain it of the 40 gals or so in it now (and put that gas in my truck)? That will be a chore, and how does that get the gunk off the bottom? Won't it remain?

[Blue Agave]

Draining the tank won't hurt and it will give you the opportunity to see what the contents of the tank looks like. Not sure about your area, but here in Florida you can have someone pump your tank out which flushes and cleans the tank out.

[CLM65]

Keep in mind that shortening your pickup tube will result in a little less useable volume in your tank, and only buys you time until debris or water becomes a problem.  Plus, the more water and debris in there, there more likely it will get sucked up when you hit a wake or rough water and the tank contents get shaken up.  Not saying shortening it is a bad thing, but just pointing out the "cons".

[Blue Agave]

Not sure if this was mentioned earlier in the thread, but you may want to change the fuel bulb as well. Those have been know to cause issues as well. OMC/ BRP fuel bulbs are know to be good quality as well as the Quicksilver fuel bulbs, these can be used on any motor regardless of manufacter.

[daniel123]

I am changing the primer bulb too -- its part of the replacement fuel line that Moeller sent. Good points about the shorter fuel tube. Where do you go to have the fuel tank sucked out? Maybe I can find a comparable service here in Ohio. Do they give it back for use in your vehicle? I've got some 40 gallons...

[CLM65]

I went to a local place here in Florida.  It was actually a "backyard" kind of operation, which was literally in someone's back yard.  The only way I found out about it was through my mechanic.  Maybe you can check with the local boat mechanics and see if they know someone.

The equipment my guy used was a skid mounted pump/filter/separator that recirculated the tank contents until the particulate and water were removed.  Seemed to work pretty good, and I got to keep the remaining gas.

[daniel123]

Thanks, Craig. I'll look around for such a service. Perhaps do a CL post.