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Adding a sump to stock fuel tank


Supercivic
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So I'm looking for an easy and cheap way to fit the fuel pickup problems that EF civic's are known for.  I'm looking to add one of these to my stock tank and run an inline fuel pump.

 

I know that you can run a cell that's 2 gal's more then stock (which seems unfair btw plus the .5 gal for a swirl pot)  I just can't afford to go that route at the moment.  What do you guy's think of this setup?

Image result for fuel tank sump

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1 hour ago, Supercivic said:

So I'm looking for an easy and cheap way to fit the fuel pickup problems that EF civic's are known for.  I'm looking to add one of these to my stock tank and run an inline fuel pump.

 

I know that you can run a cell that's 2 gal's more then stock (which seems unfair btw plus the .5 gal for a swirl pot)  I just can't afford to go that route at the moment.  What do you guy's think of this setup?

Image result for fuel tank sump

 

Sure is unfair that Civics get to add 2 gallons to their 11 stock while our Mustang can also only add 2 gallons to our 15.4 stock.  Definitely not proportional.

 

Anyway, also no to modifying a stock tank, it is not allowed.

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8 minutes ago, Supercivic said:

Is it actually not allowed?  I dont remember anything about modifying a stock tank.  Whats that wrong with it if i get it pressure tested lots of drag race Hondas running this setup.

9.10.2.1.
Stock fuel tanks in stock locations OR approved fuel cells are the only fuel sources allowed
for competition.
9.10.2.2.
NON-OEM REPLACEMENT OR SWAPPED FUEL TANKS ARE NOT ALLOWED. It’s either stock, in
the stock location, or an approved fuel cell with the proper installation.
 
From the rule book.
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so are you planning on using this more like a 1/2 gallon surge tank and installing it down stream from the tank and not actually making any modifications to the stock tank? 

 

or do you have to modify the stock tank in any way to make it work?

 

Also, send it off to Phil and get his stamp of approval. 

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10 minutes ago, Supercivic said:

Not to be a stickler but it doesn't say stock unmodified tank.  It will be in the stock location and largely a stock tank.

 

Well by that definition I can have a "largely" stock engine in the stock location... a stroker kit should be free right?   Not.  

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I'm just looking to help the pickup issue's from the stock tank.  I'm in now way trying to cheat especially because for some reason it's legal to add 2.5 gallon's of capacity by using a cell.  The volume of the sump is certainly less then 2.5 gallon's.  It would sit on the bottom side of the tank to allow for a small area not affected by fuel slosh.  I would think adding 40 gallon's to any stock tank to be impossible but that's not what I'm looking to do anyway.  I will see what phil has to say how do I get in touch with him?

 

 

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A modified tank is not stock. I think the intent of the rule is to protect somone who might not know exactly what they are doing in modifying a fuel tank. Anyone who has welded any type of fuel tank that has previously had fuel inside it will tell you its a dubious task without knowing the trick to get all of the fumes out. Say goodby to your eyebrows. Can you look into a surge tank?

Edited by MetalFusionSpeedZB
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3 minutes ago, Supercivic said:

Thanks for the hospitality guys...jeez.

You probably got jumped a little hard.  Sorry. 

 

I think the rule is in place for safety.   The stock unmodified tank, in its original location has been crash tested.  If you modify it, it's no longer tested.   Fuel cells have to be sfi certified, again safety tested     

 

 

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  • Technical Advisory Committee

Man youze guys       a little sawing ,a little brazing ,some  jb weld it'll be just fine .. it's only a gas tank y'all act like it's gonna leak ,catch fire or explode or something.. 

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Hold the phone guys...  I totally see his point, he has pickup issues, and adding a surge tank isnt modifying a stock tank...  Ive thought about it for similar reasons, more of the additional capacity.  I hate that you can add 2gal with a fuel cell.  its essentially buying extra capacity (which was actually petitioned for).  2 gal on the right car is the difference between another pit stop in a race...

 

So why can you add a 2gal surge in-line to an unmodified stock fuel tank?  

 

NOTE: Devils advocate statement, I dont think you should be allowed to do it buuuuuttttttttttt, I dont see it being strictly illegal.

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16 minutes ago, Miata PI said:

Hold the phone guys...  I totally see his point, he has pickup issues, and adding a surge tank isn't modifying a stock tank...

Adding a surge tank is perfectly legal. It looked like he was going to cut a hole in the bottom of his tank, and weld in that sump to draw fuel from.

16 minutes ago, Miata PI said:

So why can't you add a 2gal surge in-line to an unmodified stock fuel tank?  

Probably a safety issue... (2 gallons of fuel sitting in an aluminium cube... less safe than 2 quarts in a cube)... (edit: apparently there are SFI rated 2 gallon surge tanks!)

 

Safety issue aside, I agree with the premise of "we don't want to add a fuel cell, but we don't want to be handicapped by 2 gallons compared to teams who did add fuel cells".

 

This rule is clearly an example of writing a rule for convenience "hey, .. we want you to be able to find and use a standard fuel cell size and not have to jump through hoops"... and having it turn into a 'semi-required performance upgrade'.

Edited by enginerd
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Way back when... you used to be able to add a 2 gallon surge tank but people were plumbing them to just add capacity.  That was when the surge volume was reduced to 0.5 gallons.  

 

Yes I have a 2 gallon surge tank on the shelf and they are available SFI rated.  

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