External fuel pump?

[Jtrux]

I have a TBI 2.5L in my MJ and I'm considering an external fuel pump.

 

Has anyone done it?  

 

If so, what pump did you end up using and why?

 

Thanks

[daking]

Why go with an external for your application? Accessing the intake pump is not that difficult.

 

I'm going with an external because I can't get ~49 PSI out of a stock one. (I put in a ~49PSI regulator, & still get ~38PSI max).

 

Not sure where I'll mount it. I may put it where the factory fuel filter is, and move the filter. Here is what I bought :

 

http://www.amazon.com/gp/product/B000DN7VME?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00 

[HOrnbrod]

I'm going with an external because I can't get ~49 PSI out of a stock one. (I put in a ~49PSI regulator, & still get ~38PSI max).

 

Something's wrong then. The stock submerged pump should put out 49psi easily, w/o vacuum hooked up of course. I've been running 49psi OBD2 injectors for years using an adjustable regulator. Should do the same using a fixed 49psi OBD2 regulator.

 

Are you trying to get 49psi with the vacuum line hooked up? If you are using 49psi injectors with a 49psi fixed regulator, pump pressure reading on the rail should be ~49psi w/o vacuum.

[daking]

 

I'm going with an external because I can't get ~49 PSI out of a stock one. (I put in a ~49PSI regulator, & still get ~38PSI max).

 

Something's wrong then. The stock submerged pump should put out 49psi easily, w/o vacuum hooked up of course. I've been running 49psi OBD2 injectors for years using an adjustable regulator. Should do the same using a fixed 49psi OBD2 regulator.

 

Are you trying to get 49psi with the vacuum line hooked up? If so, why?

 

 

I had 2 different pumps, nether would push greater ~39.

 

I'm using ~87 fuel rail, with 91' engine, with 2000+ intake, with high flow injectors 27# if I recall.  I'm using a modified MJ fuel mount + 91' pump.  Everybody running these injectors says ~49PSI is best (at 0 Vacuum).   

 

I replaced the regulator in the fuel rail with one rated at 39PSI. Not adjustable. I'm debating just getting the adjustable one.

 

Admittedly the engine runs like a beast, spins em in 1st, spins em going into 2'nd, and chirps em going into 3rd. So, it is making power. But my AFR at WOT is not where I'd like it. It does not hold at "rich" when at WOT. My current guess is not enough fuel pressure at 0 Vacuum.  

[HOrnbrod]

Which 39psi fixed regulator are you using? I used the Mopar 5277828 regulator and ran it at 39psi with no problem for awhile before I got the Hesco adj. FPR. Other fixed 39psi regulators that are supposed to work are the Chrysler 4418850 and 5277864. Don't know if that's valid for a Renix fuel rail though..........

[daking]

Which 39psi fixed regulator are you using? I used the Mopar 5277828 regulator and ran it at 39psi with no problem for awhile before I got the Hesco adj. FPR. Other fixed 39psi regulators that are supposed to work are the Chrysler 4418850 and 5277864. Don't know if that's valid for a Renix fuel rail though..........

 

Typo, I meant to write  " I replaced the regulator in the fuel rail with one rated at 49PSI". Yet fuel pressure gauge reads 39PSI.