71 510 Stock Fuel Tank to EFI?

[Esteep]

I'm doing an sr20 swap and I want to use my stock fuel tank, my set up is a carburetor/lift pump to surge tank to main pump, but I don't have a return fitting for my return line. So my question, Could I remove the top breather hose from the tank and connect my return line there?  How much would it affect my fuel consumption? any one ever try it?

[Esteep]

 

On any of the two circled fittings? 

 

[hosestop@msn.com]

Are you going to use a 280zx replacement pump (external ) or some other ebay model, I use the feed at front R.side for return line 1/4 only  for a return at tank or drill and make 3/8 male a&n ,and  next  part is dangerous and pay a PROFESIONAL to WELD a bung in rear center of tank ,spare tire area, for a  90 deg.3/8  o ring seat fitting to #6 A&N.

[hosestop@msn.com]

The sr needs only a 5/16 hose I was overkill with 3/8 sometimes.

[Esteep]

Are you going to use a 280zx replacement pump (external ) or some other ebay model, I use the feed at front R.side for return line 1/4 only  for a return at tank or drill and make 3/8 male a&n ,and  next  part is dangerous and pay a PROFESIONAL to WELD a bung in rear center of tank ,spare tire area, for a  90 deg.3/8  o ring seat fitting to #6 A&N.

 

I'm using external pumps, the carburetor/lift 4-7psi pump I picked up at a parts store and I got an MSD pump for my main pump around 40psi, I was trying to avoid welding anything to it but if I have to I will.

 

The sr needs only a 5/16 hose I was overkill with 3/8 sometimes.

 

Yeah I'm going to use 5/16 lines as both pumps, surge tank and filter  have 5/16 fittings.

[hosestop@msn.com]

Hey bro really need that zx pump (I like rubber stock mount also) or oem pumps think 80 - 90 psi sr runs at 43 and boosted raises to 53 and a stock pump seems better with stock regulator on fuel rail will hang awhile just my two cents!