Fuel cell inspection questions

Edited: 3/28/2006 4:02:44 PM by Low_SST

I now have a fuel cell and we need gas cap pressure testingso i was thinking of temporarily clamping my stock hose on just to get it tested and then putting my metal cap on other then this would i need to do more?



My other question is that i have 3 ports on top but i need to know which ones to plug because i modified my cell to use my stock fuel pump/sender setup. I think the ones i have plugged now are return and outlet and i had a filter on my rollover vent.


My last question is about foam/ baffling. My stock ram tank had no baffling or foam... do i still need it with this cell?

I might be wrong the use of foam or baffling is to keep the fuel from splashing around some much, so It reduces the possibly of it exploding.....Its not need tho....but is something good to have.

yea ive read that but i would assume that would be more of an issue with a tank with external pumps and stuff. I was just trying to figure out what the deal was because my stocker had no baffling or foam in it or even a bladder, gas was free to slosh so what gives with a cell?

other then the obvious difference betweenmy stock unit and what people typialy run on cells is there somethign different with my stock unit that would allow for better venting so it could be used without foam or baffling like it was in my stock tank?

I'm not 100% but on chevy's you don't need baffles if your running the stock unit and the sender touches the bottom of the cell. The cup on the bottom of the sender is the reserve for the pump. There is a venturi that actually keeps this cup filled. Besides, the gasohol the stations supply now break down foam and other rubbers/plastics. The 3 ports are the pressure side to the engine, the return and the evap line. Just look at the sender out of the tank and see which ports they run too. If your not running a vented cap then it will be better to keep the evap unplugged with a rollover valve on it. If you don't you will either create vacuum or pressure depending on the situation. Instead of a rollover valve you can also loop fuel line and leave it open to atmosphere, just like NHRA drag race rules suggest.

Oh and foam is used so you don't starve the pump under hard cornering, braking and acceleration.

Did you already shave your gas door?

no i havent shaved my gas door, my cell is in the bed so i was just thinking about mounting the cap in the stock location for inspection with nothign behind it. The only ports on top ive plugged were the return and pickup the rollover was open but i was gonna leave a filter on it but i might just get some fuel line and run it off of it. I also have a line coming off my pump to the charcoal canister so that will vent too. Do you have any idea how long that loop should be for the vent off of the rollover vent?

the third one is the rollover

Well for the inspection, just get your stock filler and cut the tube off just behind the metal flap. Then put a properly working stock cap on it. During inspection, they only take the cap off and test it. They don't climb under your car to see where the tube goes. Cover the cell with some cardboard box or other junk. For your fuel system, I'm unclear on how you intend to run it. I thought you were going to run the complete stock setup and plug all the holes that the cell came with? I'm building a cell right now and all you really need to do is make the adapter bung (like you already did). Hook up the lines like stock. Make sure the level sender has enough travel and bend the float so when your tank is empty it reads empty. (Depending on the depth of your stock tank compared to the new cell it may read less than full but at least you know when it's empty. If you don't run the stock lines you are going to trigger the check engine light so it won't pass anyway at least under OBDII....what year is that truck?