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Fuel Surge tank - Under hood?


shanehutton
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I am putting a fuel surge tank in a hatchback civic.

There are two things that make me want to put it under the hood.

-Access to lines for an easy and clean install.

-Already firewalled.  The hatchback means I have to create a big box for it if I put it inside the car

 

Are there any rules that would cause an issue?

Any good reason why it is better off inside the cabin in a box than under the hood?

 

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Why not in the engine compartment ?(regardless of under hood location)

 

Cons:

A really hard front hit, busted mounts, crushed tank or pulled lines and now there is a half gallon of fuel under pressure spraying everything broken, exhaust, cut main harness etc.

 

 

Pros:

Honda has a nice "battery nook" that is likely pretty safe.

 

Been there done that, a huge fire, fortunately it was contained to under hood  (no surge, just a bad hit that severed fuel/elect/exhaust)

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Ours is up front in the engine bay.  We just removed stock filter and used a slightly larger filter + pump.

 

Fuel lines run through there either way.  I do not see any increased risk of fire over a stock filter and fuel lines.

 

We did aim a fire nozzle at it in the bay.

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  • Technical Advisory Committee
2 minutes ago, wvumtnbkr said:

Ours is up front in the engine bay.  We just removed stock filter and used a slightly larger filter + pump.

 

Fuel lines run through there either way.  I do not see any increased risk of fire over a stock filter and fuel lines.

 

We did aim a fire nozzle at it in the bay.

 

Thats what I was getting at above. 

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Yes I was looking into either in the fender area (outside the frame rail, like where some newer cars have their battery)...  or maybe re-using some of the space where the stock air intake / wiper motors go...  up right at the base of the windshield...   I felt that was probably the safest, high up, centrally located..

 

certainly don't want anywhere that could rupture and spray a half gallon of gas in an impact...  even passenger foot-well is probably a decent spot, just put it in a metal box..  in a civic you are pretty much on top of the fuel tank, add something like an acusump, its hard to be more than a few feet away from something flammable, heck the stock fuel lines are on the driver door sill.

 

I was also looking for a location that could potentially gravity fill from the filler neck, so below the fill neck height such that a vent line could run back into the mail fuel vent system; as you get further from the tank this gets harder.

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1 hour ago, Ron_e said:

pressure

No pressure in the tank but if the lines were torn there will be pressurized fuel available, sure the same pressure is present under every car hood but usually only 2 lines, not a custom octopus worth to get in trouble during "the bad one" kind of crash.

Edited by Team Infiniti
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We just made a surge and put it in something like the battery nook in the front under the hood. It's inside the frame rail. 

 

I wondered about heat, but kind of figured there would be enough turnover in the tank so as not to cause an issue. 

 

We we have the same issue as you in that it would be hard to get a box and/or firewall between it and the driver. It was really easy to do in the engine bay. 

 

Disclaimer: it hasn't been tested in shakedown nor race. 

 

We are still thinking about moving it to the rear wheel well at some point. 

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