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Author Topic:   27 whaler gas tanks
livebaitdoa posted 04-25-2002 08:18 AM ET (US)   Profile for livebaitdoa   Send Email to livebaitdoa  
Can anyone tell me if the tanks in a 1986 27 whaler have check valves. For some reason I'm experiencing gas starvation, sometime port sometimes starboard. Motor don't want to run in midrange rpm's as long as I run them 4000 or above their fine, drop in the 3000 range and one or the other dies down. This has happened with two different sets of motors. When the ocean's calm it's not a problem. Also happen's with three different tanks.(main,port, starboard) Thanks for any help

Bugsy Malone posted 04-25-2002 08:52 AM ET (US)     Profile for Bugsy Malone  Send Email to Bugsy Malone     
I would look at your tank vents first, then the gas lines and the filters.

You also may have built up crud floatng around in the tank. This could be the case when in rougher conditions being the cause of the temporary clog of the gas line tank fittings.

If the first 3 items are ok, then you should have the tanks cleaned.

livebaitdoa posted 04-25-2002 04:00 PM ET (US)     Profile for livebaitdoa  Send Email to livebaitdoa     
Thanks for the help.
PMUCCIOLO posted 04-25-2002 04:09 PM ET (US)     Profile for PMUCCIOLO  Send Email to PMUCCIOLO     

The boat should have anti-siphon valves on the tanks. You may want to check them, as the fuel pumps on the engines may not be able to exceed the negative pressure required to draw the fuel across the valves at certain RPM's.

I hope that this helps! Good luck, and please keep us posted.


Bugsy Malone posted 04-26-2002 08:02 AM ET (US)     Profile for Bugsy Malone  Send Email to Bugsy Malone     
Just remembered livebaitdoa, on the ends of the interior tank pick up lines is a strainer this may be where the problem occurs, open the inspection hatch on the tanks and fish up the line to check -- would also mean crud present and with her age not unusual.

There are no anti-siphon devices on the tanks used for outboards only inboards.

livebaitdoa posted 04-26-2002 12:44 PM ET (US)     Profile for livebaitdoa  Send Email to livebaitdoa     
Thanks for the info, going to give it a look this weekend.
lhg posted 05-01-2002 05:36 PM ET (US)     Profile for lhg    
I have suspected fuel flow problems at times, and suspected an anti-siphon tank on my one-owner Outrage 18, per my Mercury owners manual.

I can assure you MY 18 Outrage did NOT have a factory installed anti-siphon valve. I took the whole system apart, but found only "straight thru" hose barbs.

But I had "livebait's" problem on my twin 200 Mercs. Problem turned out to be the check valves in the primer bulbs. They do go bad! Try replacing those. Walmart has the Attwood brand for about $4.50 each. These also serve as the anti-siphon valve on an outboard.

Another way to check for fuel system flow problems is to plug the engine into a remote 6 gallon tank and line, and see if it runs OK. If not, your problem is in the engine.

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