| [ Total Views: 3318 | Total Replies: 73 | Thread Id: 71523 ] |
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 Hutcho
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| posted on September 18th, 2008 at 09:03 AM |
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| Quote: | Originally
posted by vw54
i would open the feed line up to 1/2 inch
what pump will you be using whats the size of the inlet on it ???
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Fair call, Dave. I think I will. The pump has a 1/2 inch inlet.
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 vw54
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| posted on September 18th, 2008 at 09:29 AM |
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Most new type EFI pumps have a 1/2 " inlet or feed and a 5/16 " outlet
if you dont increase the inlet line you will most probally find the pump will starve for fuel
and wont maintain correct pressure in the system
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VWCOOL
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| posted on September 18th, 2008 at 10:03 AM |
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| Quote: | Originally
posted by MickH
You gotta like the way it mixes the warm return line fuel with the "cooler" fuel in the tank
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yeah that helps with evap emissions control but VW would have sited it there to keep fuel available at the outlet, right down to an absolutely empty
tank
Pay your debts, CxxT
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Baja Wes
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| posted on September 18th, 2008 at 11:29 AM |
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Great pics and info on the type 3 EFI tanks guys.
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VWCOOL
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| posted on September 18th, 2008 at 11:35 AM |
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Do you reckon a USA Beetle Cabriolet EFI would be similar?
Pay your debts, CxxT
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MickH
A.k.a.: Michael Hutchinson
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| posted on September 18th, 2008 at 03:35 PM |
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| Quote: | Originally
posted by VWCOOL
| Quote: | Originally
posted by MickH
You gotta like the way it mixes the warm return line fuel with the "cooler" fuel in the tank
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yeah that helps with evap emissions control but VW would have sited it there to keep fuel available at the outlet, right down to an absolutely empty
tank
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DUH
tssnq.com.au
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pete wood
A.k.a.: figure itout
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| posted on September 22nd, 2008 at 11:11 AM |
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who'd a thunk this thread could have gone on so long... 
some good stuff in here though.
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GeorgeL
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| posted on October 4th, 2008 at 02:18 AM |
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There is a happy medium between no swirl pot at all and a full-blown low-pressure-pump-fed swirl pot.
You can add a 1-liter can beneath the tank with an inlet from the tank at the top, an outlet to the pump at the bottom, and an vent outlet at the top
that is plumbed into the vent line at the top of the tank. This way you always have 1 liter of fuel available to the pump. The level might drop
momentarily during heavy acceleration, but unless you keep your foot in it for a full liter's worth of fun you'll never starve the pump. When you
get off the gas the can will refill via gravity feed.
I've seen this done when adapting carb vehicles to EFI where the owner didn't want to alter the stock fuel tank. Seems to work fine.
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Baja Wes
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| posted on October 4th, 2008 at 04:39 PM |
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That's the set-up I originally had. It didn't work. The fuel in the surge tank got too hot. See the other surge tank thread.
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GeorgeL
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| posted on October 5th, 2008 at 06:07 AM |
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| Quote: | Originally
posted by Baja Wes
That's the set-up I originally had. It didn't work. The fuel in the surge tank got too hot. See the other surge tank thread.
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Probably because you plumbed your fuel return to the surge tank. If you plumb it to the main tank it should not overheat.
Here's an interesting approach, the $30 surge tank:
http://www.geocities.com/hrayhouston/antisurgetank.html
(not recommending, but he seems to have had good luck with it!)
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Baja Wes
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| posted on October 6th, 2008 at 12:47 PM |
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You can do that but you need a very large line going from the main tank to the surge tank, as the fuel flow rate is very high and you don't want to
restrict the HP pump at all. If you do it will have a shorter than normal life.
Depending on your pump size a 1L surge tank will last between 15 and 30 seconds without fuel being fed to it. For offroading I wanted a little longer
than that. When I used to have a VW engine I used to find the oil light would come on sometimes, particular down steep hills. I didn't want the same
problem with the fuel.
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rocknrob
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| posted on October 6th, 2008 at 06:01 PM |
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Well if you are fortunate enough to drive a kombi there is room to
slot a decent surge tank in...also gives a bit of reserve in emergencies....
[img] [/img]
[img] [/img]
I've got it sloping down to the pump to get the best effect and reduce sloshing...holds 5litres and the return goes into the high end and from
there the breather goes back to the tank. Didn't even need to change the miserable little 6mm outlet from the tank
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Hutcho
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| posted on October 6th, 2008 at 07:24 PM |
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| Quote: | Originally
posted by rocknrob
Well if you are fortunate enough to drive a kombi there is room to
slot a decent surge tank in...also gives a bit of reserve in emergencies....
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Looks good, Rob.
Is that clear, steel coiled, hose for the coolant? Would be intersting to see the flow over the longer distances.
Steve
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rocknrob
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| posted on October 6th, 2008 at 08:12 PM |
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No Hutcho...that was just some hose i had lying around and used for a test fit...I used the black rubber stuff with the green stripe to get over the
hump and stainless for the rest how's your engine going?
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