I finally figured out how to get my gas cap to stop leaking gas onto the outside of the top cap, but the cap does not vent fumes now. I unscrewed the the little surge valve on the center of the cap and filled it with RTV, so the cap now makes a tight seal and keeps gas in. But the tank does not vent as well now and I noticed that when I pop the gas cap, you can hear the pressure release from the expansion/fumes.
Is the tank only vented through the cap, or is it vented elsewere?
I'd remove the RTV ASAP. That is the only vent that I'm aware of. I'm sure you checked the seal in the cap, right? I would think it would have to be that or the cap itself is warped.
2019 Ranger Z520C DC / 250 Pro XS 4 Stroke
The gasket seals. The surge valve is meant to vent gas and fumes out of the center of the cap, underneath the piece that holds the gasket (I bought a new cap and water tested it and the water comes out of the cap between the gasket holder and the cap. You can have a gasket that seals like a submarine dive hatch, but the gas WILL vent out through the surge valve underneath the gasket. That is the problem with these Perko caps on these boats.
I am thinking that I may have to find out how to vent the tank in another location, because having gas vent through the cap onto the boat is unacceptable. Maybe a very small pin hole in the cap may help.
When I called the factory, they told me to seal off the cap. Looks like I may need to consult with them again.
Any other ideas?
He can't see his tank on the 198.
I have a call into Jason Bragg. I figured this is easier than all of the disassembly that needs to take place to access the tank. This has been a real goat rope due to a poor design. I still can't figure out why most of the 198s with the plastic Perko flip cap don't leak fuel. The only thing I can think of is a change in tank design that allows the fill neck to be further away from the tank.
But the tank may be vented elsewere, since I do smell a slight gas smell in the main compartments when the boats sits for a few days without use, as I did with my old 181.
http://www.bbcboards.net/zerothread?id=696590
Look on the side in the first picture and see a small round black spot directly over the center of the wheels. That is a vent for the gas tank. Not sure how long ago they started using these.
How full are you filling the tank? Maybe that's why I don't have a problem with mine.....I never have more than 5/8 of tank. Usually I'm at a half or under.
2019 Ranger Z520C DC / 250 Pro XS 4 Stroke
it overflows with 1/2 - 3/4 tank.
That is a different design than I have... there is no external vent that I can find on the top cap.
read the bottom of this:
http://www.bbcboards.net/zerothread?id=694439
Different boat, different tank, same issue.
If you're not venting you're going to cut off fuel to the engine.
Fuel goes out, air comes in or no flow.
The way the vented caps are designed I can't see it leaking unless there is a different significant issue, maybe in your vent line.
I used to struggle filling my 206. If I still had it I would probably have vented it separately by now.
Pop
Thanks for the feedback. I have not had any performance issues yet, but I will keep an eye on this.
Please take the silcone off the cap. We had some boats in the NC , SC that would purge gas out of the tank when making sharp corners. Two options,
Run the vent line to the starboard side of the boat and back to the fuel fill with out any drops ( traps fuel ) or replace the factory fuel fill and install a non vented cap, when you do this you will need to install a vent as well.
Hope this helps Melvin
<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by bassin butch »</td></tr><tr><td class="quote">Lea where there is a will there is a way. Can't is a word I don't use.
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What I meant was, it is not quite as easy as you appeared to think it was. Getting at the under-seat tanks can be done, but you don't want to have to!!!!!
Melvin...I have the 05 Elite. I don't have any problem with gas leaking, etc, and I don't have the separate vent ....what did they do that now requires the separate vent?
I have an '06 198. My fuel tank is vented through the gas cap only. The fuel tank in my 198 is very easy to access.
There are 3 screws down the driver side, and 3 screws down the passenger side of the seat module. See picture.
There are I think 5 screws across the back of the seat module. See picture.
Once you have all the screws out, stand on the rear deck, lift the whole module seats and all, up and slightly to the left to clear the forward reverse shifter. Set it on the rear deck and the whole tank is accessible. Less than a 10 minute job with a Phillips bit power/portable drill. You may have to feel around to find them the first time, but after you have taken them out more than once or twice they become visable.
Ed R.
2006 ChampioN 198 225 Optimax
This is a good idea. I think that I am going to have to re-route the hose with a much longer one, or just add a vent with my current sealed off cap assembly.
This might help...
1. Remove the fuel tank cover:
=> The fuel tank cover is held into place with Phillips screws. Remove the screws
and slide the top portion of the fuel tank cover up to gain access to the fuel tank
sender.
2. Fuel tank sender, hose and sending wires with the fuel tank cover lid removed:
3. Remove the side Panel:
=> The side panel is held into place with several Phillips screws. Gain access to route the hose to the bilge area here:
Nice pictures Gunnar.
My 198 has the same screws as you show, but when they are removed the whole module ,seats and all lift out revealing the whole gas tank.
Ed R.
2006 ChampioN 198 225 Optimax
Thanks Gunnar! Looks like I will re-route the fill hose as soon as I get a chance. In the meantime I have drilled a 1/8" hole on the inside of the cap to allow a little bit of venting to the outside... hopefully this won't cause fuel to leak out as well.
I had to shorten my vent hose because it had slack and would fill with fuel. It would leak, but it would also keep the tank from venting when filling and make the tank all but impossible to fill. I shortened the vent hose so it can't hold fuel, problem solved. Took about 20 minutes. The aluminum plate holding the seats is held by about 10-12 ss screws. Takes a few minutes to get them located and out, but access to the tank is easy with the seat plate removed. Good Luck.
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2008 ChampioN 198
I finally got around to fixing my leaking gas cap issue. For those of you with the Perko vented caps that have this problem, here is what I did.
First I sealed off the center of the surge valve with fuel resistant RTV. I just unscrewed the valve , filled it with RTV, and put a small crew in the back of the pop up valve to hold it shut. I then filled the center of the cap with RTV as well, where the surge valve screws in. I then screwed the surge valve back in. Next, I popped out the rubber cap seal and put "form a gasket" in the groove, then pushed the seal back in place. This procedure will make the gas cap air and fuel tight.
Now for the venting. I pulled the seats to expose the gas tank and cut the original vent line that runs to the cap and installed a 3/4" brass "T". I then mounted a Perko tank vent next to the gas cap and connected the vent to the "T" using 5/8" fuel line. Now the tank is vented and any gas that splashes into the cap can also find its way back to the tank via the original cap vent or the fill tube.
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