2nd Gen Non-Engine/Transmission Fixed my tank vent problem

[rashwor]

Last week, I decided to fix the problem with the vent on the fuel tank. It has been stopping up since the truck was new back in '99 due to all the mud and such the truck is exposed to. I would unstop the tank vent and a week later I would have suction on my fuel cap again when I first opened it. No, there is no cap over the fuel tank vent... did not ever have that problem, just mud and dirt.



I got to thinking, there has got to be more than one way to skin this cat. I took my cordless drill, and drilled a very small hole in the lower portion of the fuel cap on the tank, creating a small vent hole. The exterior of the fuel cap is loose and allows air in, it was just a matter of allowing the air to get into the tank from the outside of the cap. Cleaned the cap really well so no trash or shavings got into tht tank.



No suction on the fuel cap since this was done over a week ago. Problem solved!

 

[illflem]

There is also a vent on top on the tank that can get clogged. What I've seen a few people do is connect a small tube and route it up high where debris has a harder time entering.

 

[rashwor]

The vent...

on top of the tank is what was clogging. The vent hose would work too. This was faster and easier to me.

 

[San Felipe Bob]

Interesting

I may be crazy here .

I thought I had this "vent "problem.

When I remove my Fuel cap I can here a hissing sound indicating air escaping.



However!

I removed the cap and noticed that the cap has a vent system built in.

The next step was to see how it works.



I wiped the cap off and did the Ol mouth test.

I found that the cap allows air INTO the tank, but does not allow air OUT of the tank.



The "hissing sound " must then be air pressure inside the tank.



Do I have this "Vent" problem?



SFB

 

[illflem]

According to the manual the cap should release pressure at 1. 95 - 2. 5 psi (blowing) and vacuum at . 14 -. 29 psi(sucking). You don't want it freely venting or else fuel can come out.

Don't know if you've ever tried blowing on a pressure gauge but I've never been able to get even 1 psi out of my lungs, but can draw a pretty good vacuum.

 

[JohnE]

Originally posted by illflem

...

Don't know if you've ever tried blowing on a pressure gauge but I've never been able to get even 1 psi out of my lungs, but can draw a pretty good vacuum.

How the he!! did you manage over 7,000 posts without putting out?

 

[rashwor]

The only way...

fuel is coming out is if I manage to turn the truck over. It could happen, but I am not planning it at this time. Sloshing is neglible up at the cap (crooked tank neck and high cap, etc) and the vent hole is just barely big enough to see.