EFI - Carb conversion Pump through Dead EFI???

samuraichamploo

Member

Mar 18, 2004

367

0

16

Beaumont, TX

Jun 29, 2004

#1

• Jun 29, 2004

• #1

Im converting from efi to carb.
Everything is almsot done, last issue is the fuel.
Can I just cut the power for the in-tank EFI pump, and hook up my holley blue outside of the tank? I know I can blow very easily through the holley blue, so I wouldnt see a reason that the holley couldnt pump through a dead EFI pump. (I am doing all of this to keep the existing pickup BTW)

Thanks much!

 

dastang2

Active Member

Dec 11, 2003

2,020

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46

tx

Jun 29, 2004

#2

• Jun 29, 2004

• #2

i tried it on an efi truck and it did not run to well, it would idle fine but when revved it popped and died. so i was pretty sure the fuel pump in the tank was the problem since the motor ran fine when i use a gravity feed fuel tank on the fender to test the engine out.

 

samuraichamploo

Member

Mar 18, 2004

367

0

16

Beaumont, TX

Jun 29, 2004

#3

• Jun 29, 2004

• #3

What about if I use the stock EFI pump and just use a regulator?

 

M

mustangman33

Member

Mar 13, 2004

262

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16

Chicago, IL

Jun 29, 2004

#4

• Jun 29, 2004

• #4

yep, thats what i did on my 95, i first went with the 20 dollar holley regulator and it didnt give me enough pressure, then got a mallory one that works great.

 

samuraichamploo

Member

Mar 18, 2004

367

0

16

Beaumont, TX

Jun 30, 2004

#5

• Jun 30, 2004

• #5

Really? you dont have any problems???
****, I just might use the EFI pump and a regulator then.

 

dastang2

Active Member

Dec 11, 2003

2,020

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46

tx

Jun 30, 2004

#6

• Jun 30, 2004

• #6

make sure it is a return style regulator and also make sure that your return line is bigger than your feed line or you could have problems like burning the fuel pump out

 

R

ratrapp

New Member

Apr 24, 2004

510

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buena vista,va

Jun 30, 2004

#7

• Jun 30, 2004

• #7

several years ago i worked on an 80 something firebird that somebody had converted from tbi to carb but they kept the original electric intank pump.it caused flooding and other problems.i installed a mechanical fuel pump and just disconnected the electric and the stock pump pulled fine through the old electric pump.all's fine 5 years later.

 

samuraichamploo

Member

Mar 18, 2004

367

0

16

Beaumont, TX

Jun 30, 2004

#8

• Jun 30, 2004

• #8

Question- Which fuel line is the return one?
I guess the only way to tell is turn on the fuel pump and see which one shoots out gas!!
Would it be a bad idea to mount the holley pump under hood? I only ask because that would be the easiest place to splice the fuel line.

 

dastang2

Active Member

Dec 11, 2003

2,020

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46

tx

Jun 30, 2004

#9

• Jun 30, 2004

• #9

put it at the fuel tank and as low as possible, i forgot which is which

 

samuraichamploo

Member

Mar 18, 2004

367

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16

Beaumont, TX

Jul 1, 2004

#10

• Jul 1, 2004

• #10

ok, cool