Alopez0105 Posted January 31, 2021 Report Share Posted January 31, 2021 Hello everyone. Has anyone had fuel vent problems with their redfishers ? Started having problems a couple of months ago and I just can't get it figured out. I removed the mesh from the vent and cleaned up real good . I also removed the hose from the gas tank and was able to blow air with a compressor into it with no problem . Today I did a little experiment and as I was filling up I removed the entire cap that holds the mesh and still had issues. After 3-4 gallons the fuel would would come up . Thank you in advance . Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 2, 2021 Author Report Share Posted February 2, 2021 Bump Quote Link to comment Share on other sites More sharing options...
smilemaker Posted February 2, 2021 Report Share Posted February 2, 2021 Does the boat have a charcoal filter on the vent? If you have access to the vent hose look for kinks and loops that may be holding up air flow. Many vent hoses will have a loop higher than the vent itself and this will restrict air flow. Have you tried blowing air from the vent into the tank with the fill cap removed.(don't do this with cap on as it may overpressurise the tank.) Quote Link to comment Share on other sites More sharing options...
MuddyBottomBluz Posted February 2, 2021 Report Share Posted February 2, 2021 While the vent may be a good starting place there are other issues that can cause the same issue. In particular an obstruction in the fill line, did something maybe fall in it without your knowledge? My problem on a non-MBG product was the fill line itself, the factory has everything pre-made ready for install so one size fits all. What happened in my case was that the fuel line went down into the bilge and then back up towards the tank. This in turn caused the fuel to be pushed into the tank rather than gravity fed. Could only get a gallon or so in before the big burp at the deck fitting unless I went reaaaaaaaal slow, made filling the boat a major issue, especially on the water. Just maybe your fuel line shifted, a strap corroded and the fuel line is no longer following a direct path to the tank. Quote Link to comment Share on other sites More sharing options...
GlennF Posted February 2, 2021 Report Share Posted February 2, 2021 I had a 2013 RF and while I did not have that issue I recall some others did. I think there are some old threads regarding this issue, key is finding the right words in your search. Quote Link to comment Share on other sites More sharing options...
Shallowminded6 Posted February 2, 2021 Report Share Posted February 2, 2021 Could be your antisiphon valve sticking. How many hatches on your front deck. If you have 4 on the front deck, access plate is in large hatch. Quote Link to comment Share on other sites More sharing options...
SCFD rtrd. Posted February 3, 2021 Report Share Posted February 3, 2021 My bet is on the charcoal filter. I think MBC started using them in 2012, before they were required. There has been several posts over the years about the same issue ( very slow filling with gas and burping back ). Quote Link to comment Share on other sites More sharing options...
B2TB Posted February 4, 2021 Report Share Posted February 4, 2021 I had the problem on my 18HPX. Had a few places look at it and all thought it was the vent but the "fixes" didn't work. Finally a tech removed the fill line. At first he thought it was a faulty check valve but then found a plastic cap from a fuel stabilizer bottle in the line. Now it takes me 5 minutes to fill the tank rather than 1 hour! Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 Hey thanks everyone . I dont think have a charcoal filter . There is nothing on vent line but the hose. I did blow through the vent line with a compressor and air flows through with no problem . Are you guys suggesting I look into the actual fill line itself ? What would be the process on this . Remove fill hose from the tank , then remove the screws that are holding down the fuel tank gas cap and pull ? My boat only has 1 large hatch up front . Replacing the vent line seems like a mission since i dont have access . I am attaching photos for review. Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 On 2/1/2021 at 10:18 PM, smilemaker said: Does the boat have a charcoal filter on the vent? If you have access to the vent hose look for kinks and loops that may be holding up air flow. Many vent hoses will have a loop higher than the vent itself and this will restrict air flow. Have you tried blowing air from the vent into the tank with the fill cap removed.(don't do this with cap on as it may overpressurise the tank.) On 2/2/2021 at 5:59 AM, MuddyBottomBluz said: While the vent may be a good starting place there are other issues that can cause the same issue. In particular an obstruction in the fill line, did something maybe fall in it without your knowledge? My problem on a non-MBG product was the fill line itself, the factory has everything pre-made ready for install so one size fits all. What happened in my case was that the fuel line went down into the bilge and then back up towards the tank. This in turn caused the fuel to be pushed into the tank rather than gravity fed. Could only get a gallon or so in before the big burp at the deck fitting unless I went reaaaaaaaal slow, made filling the boat a major issue, especially on the water. Just maybe your fuel line shifted, a strap corroded and the fuel line is no longer following a direct path to the tank. I dont see a charcoal filter, and the hose goes straight into the tank, see photo. thanks! Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 On 2/2/2021 at 6:57 AM, GlennF said: I had a 2013 RF and while I did not have that issue I recall some others did. I think there are some old threads regarding this issue, key is finding the right words in your search. thank you i will look around Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 I On 2/2/2021 at 6:59 AM, Shallowminded6 said: Could be your antisiphon valve sticking. How many hatches on your front deck. If you have 4 on the front deck, access plate is in large hatch. I just have one hatch up front . Where would this valve be located?> Quote Link to comment Share on other sites More sharing options...
smilemaker Posted February 5, 2021 Report Share Posted February 5, 2021 perpective on up or down can be misleading in a picture. it appears that the vent hose goes downhill from the tank and then probably goes up to the vent. this might be acting as a p trap like in plumbing. if do I would take the vent line off of the tank and reroute it so there is always an up hill path for the vapor to escape. .looking at the picture I assume that the left side of the picture is the top. Another thought would be to put another hose on the vent and fill the tank without anything on the other end. just keep it higher than the fill. I'm not fond of the vent so close to the fill and that might be your problem. As gas comes in the tank the vent is so close it gets overwhelmed. Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 I don't think the vent hose unites with the main fuel line . It just goes straight into the vent . But to be honest I can't be 100% since since don't have access due to the pvc in the way . The problem just started happening 2 months ago though . I've had the same hoses and the same boat for the last 3 years . Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 Just now, Alopez0105 said: I don't think the vent hose unites with the main fuel line . It just goes straight into the vent . But to be honest I can't be 100% since since don't have access due to the pvc in the way . The problem just started happening 2 months ago though . I've had the same hoses and the same boat for the last 3 years . Left is the top of the boat Quote Link to comment Share on other sites More sharing options...
Shallowminded6 Posted February 5, 2021 Report Share Posted February 5, 2021 1 hour ago, Alopez0105 said: I I just have one hatch up front . Where would this valve be located?> Its where your vent line attaches to the tank. The metal fitting that is threaded in the tank has it in it. Not sure where your access is for the tank on that model. Some others seem to have more experience with the charcoal filter, hopefully that is your issue as its easier to get to. Quote Link to comment Share on other sites More sharing options...
smilemaker Posted February 5, 2021 Report Share Posted February 5, 2021 if the problem is recent I would remove hose from the tank and look for an obstruction. fiberoptic cameras for lookig into things can be bought fairly cheap from harbor freight or northern tools. Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 Thanks yeah I don't think I have thr valve. Will look into thr charcoal filter. Thx Quote Link to comment Share on other sites More sharing options...
Alopez0105 Posted February 5, 2021 Author Report Share Posted February 5, 2021 This is a great idea ! Thanks Quote Link to comment Share on other sites More sharing options...
blewbyu Posted February 21, 2021 Report Share Posted February 21, 2021 Do those flat vents unscrew to inspect and clean filter? Quote Link to comment Share on other sites More sharing options...
jh141 Posted February 21, 2021 Report Share Posted February 21, 2021 Yes, the one pictured has an Allen head in the center to remove and service. Quote Link to comment Share on other sites More sharing options...
Shallowminded6 Posted February 21, 2021 Report Share Posted February 21, 2021 On 2/4/2021 at 7:07 PM, Alopez0105 said: I I just have one hatch up front . Where would this valve be located?> They are on the fuel supply line going from tank to engine. Its built into the fitting(barbed nipple). Was a problem I heard of people having when I replumbed all my hose lines. 1 Quote Link to comment Share on other sites More sharing options...
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