MY to EJ How essential is a surge tank?

legacytt · Post by **legacytt** » Thu Aug 17, 2006 10:12 am

Just doing the EJ18 to MY Coupe swap. I have only ever done conversions on cars which were allready EFI so need clarification. Can I just rig up an EFI pump from the fuel outlet or must I have a surge tank? If a surge tank is essential I presume it goes after the pump?

Also for some reason the 4WD tank I have just put in has only one outlet and doesn't have the small inlet for the return line, which the 2wd tank did have.
I have read that it is best to use the tank breather as the return line. If I do this I will have a breather disconected, can I just T the line from the charcoal canister into one of the lines to the breather?

One thing of interest is that the coupe had captive nuts for the rear diff hanger on the drivers side, but none on the passenger. I was expecting none at all.

BRUMBERTY · Post by **BRUMBERTY** » Thu Aug 17, 2006 12:20 pm

You should be fine as long as you don't go around any corners, or up any hills.

A move to Cooper Pedy would make this much easier.

MUDRAT · Post by **MUDRAT** » Thu Aug 17, 2006 12:42 pm

I'm not running a surge tank and have no issues until the tank gets real low, ie below empty on the gauge.

stinky · Post by **stinky** » Thu Aug 17, 2006 1:27 pm

I've got an EJ18 in an MY and have the MY fuel pump feeding the VL fuel pump with no worries. Plenty of steep hills and corners with no problems.

legacytt · Post by **legacytt** » Thu Aug 17, 2006 2:12 pm

Cheers for the info folks will proceed sans surge tank and see how it goes.

wagonist · Post by **wagonist** » Fri Aug 25, 2006 12:49 pm

Surge tanks are there to prevent EFI Fuel pump starvation under low fuel, high lateral loadings & high tilt angles on the car.
Avoid these & you should be ok.

If you do decide to fit one, you'll need a pump between the fuel tank & the surge tank. The EFI pump goes after the surge tank.
Connect the fuel return line form the engine into the surge tank, & T the overflow line from the surge tank into the fuel tank breather line.

Outback bloke · Post by **Outback bloke** » Fri Aug 25, 2006 1:37 pm

& T the overflow line from the surge tank into the fuel tank breather line.

No don't. You will end up with fuel coming out of the charcoal canister. If you don't have a 3rd line then run one.

SuBaRiNo · Post by **SuBaRiNo** » Fri Aug 25, 2006 9:18 pm

yeah BYB-01 is right... i had that problem... car acted like it was flooding... only i had no carbin canister so fuel was getting pumped into the evap lines on the engine.

Best way is to get another feed line off a donor car the same as yours and run it parellel with your current feed line... Sikaflex works great to keep it in place.

Dave

The AUSubaru.com.au Forums

MY to EJ How essential is a surge tank?

MY to EJ How essential is a surge tank?

my