With electric fuel pump OK to eliminate vapor separator?

[YGBSM]

My car:  496 with aluminum heads, CH4B intake, Edelbrock 800 carb, 26" rad, air conditioning, TTi ceramic headers.  Exhaust crossover is blocked obviously.  We are using an electric fuel pump because the Bouchillion kit relocates the compressor to the mechanical fuel pump location.

The fuel pump is a Carter 4070 (I think that is the number). Around 6 psi max.   

The engine is in and we are deciding on how to route the fuel lines.  I would like to route the fuel line out the back of the block and down the firewall (instead of going towards the front of the engine) for a clean look.  This route would eliminate the vapor separator. 

Can you get away with eliminating the vapor separator if you have an electric fuel pump?

Thanks!

[firefighter3931]

I found this link for the Carter pn 4070 pump : http://www.racetep.com/webfuelspark.html

It states 4psi and 60-70gph which isn't going to be enough fuel for a 496, especially under full throttle conditions. The minimum i would run is the Mallory 110gph unit which has a 7-8 psi discharge pressure and does not require a regulator....it can be run as a dead-head unit. 

If you do experience vaporlock there's allways the option of running a return style regulator but with the fuel line isolated away from heat it could work just fine.

I ran a Carter 120gph mechanical on mine with no vapor seperator and did not have any vapor lock issues but i also insulated the fuel line where it was in close proximity to any sources of heat. 



Ron

[YGBSM]

Thanks Ron.  Could you explain how the Mallory would be safe to operate with the Edelbrock carb which wants 6 psi max?

[lisiecki1]

I thought edelbrock recommended 6 psi minimum, 9 psi max?

[firefighter3931]

Thanks Ron.  Could you explain how the Mallory would be safe to operate with the Edelbrock carb which wants 6 psi max?

You will need a regulator to reduce the pressure if that's what the Edelbrock carb wants for fuel pressure. I allways use Holley carbs and they are fine with 7-8 psi.


Ron

[YGBSM]

I watched the DVD that came with the carb again last night, and the guy on the video said that 6-7 psi is "ideal", but that it could handle a little more.  So I will try the Mallory.  Ron, this is the one you are talking about?  http://www.summitracing.com/parts/MAA-4110/

[lisiecki1]

I remember back in the day with the 360 I read somewhere they said 9 psi max and I ran it to 10 psi and it started leaking fuel out from under the step up rod covers....they said 9 psi and they meant it!   

[firefighter3931]

I watched the DVD that came with the carb again last night, and the guy on the video said that 6-7 psi is "ideal", but that it could handle a little more.  So I will try the Mallory.  Ron, this is the one you are talking about?  http://www.summitracing.com/parts/MAA-4110/

Yep, that's the one 

Honestly, i'd be surprised if you needed a regulator using that pump. 



Ron

[rrob]

I found this link for the Carter pn 4070 pump : http://www.racetep.com/webfuelspark.html

It states 4psi and 60-70gph which isn't going to be enough fuel for a 496, especially under full throttle conditions. The minimum i would run is the Mallory 110gph unit which has a 7-8 psi discharge pressure and does not require a regulator....it can be run as a dead-head unit. 

If you do experience vaporlock there's allways the option of running a return style regulator but with the fuel line isolated away from heat it could work just fine.

I ran a Carter 120gph mechanical on mine with no vapor seperator and did not have any vapor lock issues but i also insulated the fuel line where it was in close proximity to any sources of heat. 



Ron

Hi Ron: What did you use to insulate your fuel lines?     Rob

[firefighter3931]

I found this link for the Carter pn 4070 pump : http://www.racetep.com/webfuelspark.html

It states 4psi and 60-70gph which isn't going to be enough fuel for a 496, especially under full throttle conditions. The minimum i would run is the Mallory 110gph unit which has a 7-8 psi discharge pressure and does not require a regulator....it can be run as a dead-head unit. 

If you do experience vaporlock there's allways the option of running a return style regulator but with the fuel line isolated away from heat it could work just fine.

I ran a Carter 120gph mechanical on mine with no vapor seperator and did not have any vapor lock issues but i also insulated the fuel line where it was in close proximity to any sources of heat. 



Ron

Hi Ron: What did you use to insulate your fuel lines?     

Rob

Hi Rob 

I used this stuff from DEI and it works great 

http://www.designengineering.com/category/catalog/design-engineering-inc/line-hose-protection/cool-tube



Ron

[rrob]

I found this link for the Carter pn 4070 pump : http://www.racetep.com/webfuelspark.html

It states 4psi and 60-70gph which isn't going to be enough fuel for a 496, especially under full throttle conditions. The minimum i would run is the Mallory 110gph unit which has a 7-8 psi discharge pressure and does not require a regulator....it can be run as a dead-head unit. 

If you do experience vaporlock there's allways the option of running a return style regulator but with the fuel line isolated away from heat it could work just fine.

I ran a Carter 120gph mechanical on mine with no vapor seperator and did not have any vapor lock issues but i also insulated the fuel line where it was in close proximity to any sources of heat. 



Ron

Hi Ron: What did you use to insulate your fuel lines?     

Rob

Hi Rob 

I used this stuff from DEI and it works great 

http://www.designengineering.com/category/catalog/design-engineering-inc/line-hose-protection/cool-tube



Ron

Thanks Ron