Gas tank Vent and fuel line leakage

[Silent_chaos]

Sup,


So i am having couple of problems, it seems that the black cap in which the vent and the fuel lines come out of are leaking small bits of fuel.


Is there any type of sealant that can resist gas+oil mixture?(some kind of a military silicone maybe? ) Cz I really need to stop this leakage even if is in small quantities.


Another thing, im having bubbles inside the fuel line, is this related to the above problem?


How can i overcome this? It's affecting my carb settings


Pics are below

 

[hysinthius]

not that I know of. Best thing you could do is take it out clean it with some isopropyl alcohol and put it back in and see how much it leaks.

You could also go to autozone or napa and see what they have for body grommets. Maybe you can get something with a bit more "stiffness" (that's what she said!).

Its kind of the "nature of the beast" sort of thing when you have vacuum style fuel pickups as they have to pass through the tank in some way.

JD

 

[hysinthius]

Maybe its time for someone to make a nice stainless steal tank for us with pickup and vent "barbs" on it.

JD

 

[Deluge]

Which line is getting bubbles? The pickup or the return? Bubbles are normal in the return line. If it's in the pickup line, it's sucking in air from somewhere. Do you have an inline filter? Any worn spots on the line?

As far as the leaking grommet, a little moisture is normal. If it's a lot, that means the pressure in your tank is building up and trying to escape through the grommet. The vent is a one way valve, it'll allow air in but it won't allow pressure to escape. So any pressure that builds up due to heat or just long run times, is going to find an easy way out, which in this case is the grommet.

 

[Phill]

Which line is getting bubbles? The pickup or the return? Bubbles are normal in the return line. If it's in the pickup line, it's sucking in air from somewhere. Do you have an inline filter? Any worn spots on the line?As far as the leaking grommet, a little moisture is normal. If it's a lot, that means the pressure in your tank is building up and trying to escape through the grommet. The vent is a one way valve, it'll allow air in but it won't allow pressure to escape. So any pressure that builds up due to heat or just long run times, is going to find an easy way out, which in this case is the grommet.

Thats why I run a long line with a fuel filter on it rather than the vent

Breathes both ways

Run the hose up the cage and back down to the chassis and it won't leak when upside down

 

[Silent_chaos]

Thats why I run a long line with a fuel filter on it rather than the ventBreathes both ways

Run the hose up the cage and back down to the chassis and it won't leak when upside down

Please post pics if possible

 

[Phill]

It's a bit hard to photograph because of the position but you'll find some pics in this post

http://www.redcatrampageforum.com/showthread.php?t=13663&goto=newpost

 

[Silent_chaos]

It's a bit hard to photograph because of the position but you'll find some pics in this posthttp://www.redcatrampageforum.com/showthread.php?t=13663&goto=newpost

The link is redirecting me to this thread..

 

[Phill]

Try searching under vent

That's how I found it

 

[Deluge]

This.

 

[Phill]

That's the idea but I run mine out of the grommet not the cap

 

[Silent_chaos]

Which line is getting bubbles? The pickup or the return? Bubbles are normal in the return line. If it's in the pickup line, it's sucking in air from somewhere. Do you have an inline filter? Any worn spots on the line?As far as the leaking grommet, a little moisture is normal. If it's a lot, that means the pressure in your tank is building up and trying to escape through the grommet. The vent is a one way valve, it'll allow air in but it won't allow pressure to escape. So any pressure that builds up due to heat or just long run times, is going to find an easy way out, which in this case is the grommet.

Im seeing bubbles in the return line.

And yes a bit if moisture equivalent to 8-9 fuel drops. No filter and no worn spots.

Just a snappy air vent

 

[Phill]

Bubbles in the return is no problem

If it was the inlet would be different

 

[kydo32]

you can use this around your grommet its gas resistant I got it from advanced auto http://www.eclecticproducts.com/sealall.htm

 

[Silent_chaos]

you can use this around your grommet its gas resistant I got it from advanced auto http://www.eclecticproducts.com/sealall.htm

That's a very nice product. I will get it.

However, isnt this like permanent? I mean if I apply it, it's a no way back. Right?

 

[kydo32]

That's a very nice product. I will get it.However, isnt this like permanent? I mean if I apply it, it's a no way back. Right?

being that its gas resistant it will be permanent

 

[Silent_chaos]

Bubbles in the return is no problemIf it was the inlet would be different

Ok. I found out today that bubbles are found both in return line and fuel inlet line.

Any help in diagnosing this?

 

[Phill]

Ok. I found out today that bubbles are found both in return line and fuel inlet line.Any help in diagnosing this?

Sound like an air leak in the inlet hose.

Is the filter fully submerged?

Are there any cracks or splits in the hose?

 

[Silent_chaos]

Sound like an air leak in the inlet hose.Is the filter fully submerged?

Are there any cracks or splits in the hose?

Just checked. Fully submerged and no cracks or holes. Fuel line is new.

The bubbles are small. I guess they're the reason the engine is working in a sinusoidal pattern.

High rmp to low rpm to high rpm to low rpm

 

[Phill]

I have small frothy like bubbles too

No big ones though