Tomcat fuel tank access woes

Thanx Brian
the picture looks clear what to look for .. Unfortunaly there is no valve/fitting like yours inbettween the filler and venthoses right on the side. My fuel supply hose leads towards the middle if the tank way under the deck out of sight

thanks alot for your in put
I will post my progress

DickE
 
Hi Dick,
Mine looks exactly the same as Mike's pictures above. My fuel pickup's are right beside the filler and vent.

--Matt
 
And here are mine on a 2006. I only have one access on the side of the step, not the second one higher in the cockpit side. And the coaming box you see is not removable but is glassed in.

DSCN2148.sized.jpg

Sorry for the blurriness in this one, have not compared it with the earlier detailed photo and didn't see the tank level sender, need to look again today.

DSCN2146.sized.jpg

Charlie
 
When you have access to the fuel tank, what is the plan?

One item to check is the fuel pickup tube. Sometimes they are too short and reducing the amount of avialble gas
 
My fuel gauges are way off. Shows about empty when still about half full. Have always been that way. I'd like to correct that. I have never been near empty as a result but I don't usually go any great distances.

I tried to find electronic fuel flow meters but my 2001 engines don't send that information and I don't like the idea of putting the "turbines" in the fuel line to measure the flow.

Charlie
 
Hello DickE,

You describe a fuel starvation situation...can you remember if the fuel primer bulb would refill itself when you would 'pump it up'? Or, did it tend to stay 'flat' for a few moments?

In addition to concern about the fuel pick up/tank, I would suggest you go around to all the fuel line junctions and make sure none of the hose clamps are loose. When my engine exhibited similar symptoms, it turned out that air was being entrained into the fuel system at high rpm via a leak at a hose/barbed fitting juction. Tightening the hose clamp fixed that problem; no 'tank' interventions where necessary.

I'm not saying your problem isn't within the tank, only that you should also consider other sources of fuel starvation/air entrainment between the tip of the fuel pick up and the engine.

PLease let us know how it turns out.

/david
 
Ran the engine in question on a seperate portible fuel tank thru all lines and filters ...no problem
Thanks to you guys picture of the location of the fuel fitting ... I have located in the same spot as yours... Just not nearly the clear shot access like others...
I had to cut another round access on the side of the step ...just to get a peek at it.... All sorts of cables and hoses where hiding it. Also the L fitting was facing towards the middle of the boat with the hose Doing a 180 and comming in from behind.I had to cut the fuel hose off by feeling so I could get the fitting off
Then took a pipe wrench and turned the L fittng so it points outward rather then in.....for installing the new one.. Will also pull the tube out for a look tommorrow
will update when finnished
thanks for the help
DickE
DickE
 
What are you folks using to cut the round holes? Assume you are sizing them to fit on of those round access "hatches"? Did you find any core in that area?

Charlie
 
I used a RotoZip spiral saw...no balsa in the step but plenty of nasty glass dust
 
Problem solved
took out anti piece of crap valve from tank with new fitting
thanks for the feed back and pictures
they really helped

DickE
 
squidslayer":hudctevr said:
Problem solved
took out anti piece of crap valve from tank with new fitting
thanks for the feed back and pictures
they really helped

DickE
Click to expand...

I asked b4 and got no response. What "valve"?? A valve is some thing that turns on and off. Do you mean a Right angle elbow? What exactly did you replace?

Charlie
 
anti siphon valve or ASV

It attaches to the square elbow fitting. One fitting is on a right angle with a nylon fuel pickup tube inside the fuel tank and on the outside is the ASV. It threads to the elbow and is also is barbed to secure the fuel hose. Inside of an ASV is a spring loaded ball bearing to prevent fuel leakage at normal atmospheric pressure. When pressure (vacuum) is applied it opens the ball bearing allows fuel to flow. ASV can clog with debris, rust or the spring can break
 
Problem solved
took out anti piece of crap valve from tank with new fitting
thanks for the feed back and pictures
they really helped

DickE
 
Problem solved
took out anti piece of crap valve from tank with new fitting
thanks for the feed back and pictures
they really helped

DickE
 
I assume the ASV was bad due to clogging or maybe the right angle fitting had a screen and was clogged. He replaced it and that solved the fuel starvation issue
 
Several of us have had to replace them. I replaced one of mine 2 winters ago. Mine was not causing engine problems, but it was making a buzzing noise indicating a problem with the valve so I went ahead and replaced it.
 
Thanks Was ASV valve or screen clogged, or the spring broken? It is a simple device to cause this amount of issues
 
Also, do you have any part numbers or source for that ASV? Sounds like a good spare to have on hand.

Charlie
 
Check Defender, Jamestown, West Marine, Fisheries Supply

You need to know the size I have seen 1/4" and 3/8" fittings
For ASV, it is fairly common item but again check the thread and hose barb sizes
ex
*5911
033802-10
Anti-Siphon Valve
Male 3/8" NPT x 3/8" Barb

http://www.go2marine.com/product.do?no=85910F

I just contacted the tank company b/c I replaced the fuel pickup tube, angle fitting and ASV and ordered 2 of each.

I have seen ASV with 3 different pressure release values so check it for value which may not be present in all cases or contact the tank company. The nylon fuel tube was 24" and you can cut to the correct length. I was lucky b/c mine were 24". You heat one end in boiling water for one minute and press on the fitting. There is no clamp and after cooling the tube is very snug. Either the tube, angle or ASV had a SS screen which is fine with me b/c I have Racor water and fuel filter.
 
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