think its time for a new fuel pump...

[luckythirteen13]

so i just started tuning my mustang with my wide band o2 kit. at 38psi of fuel with 24# injectors my car was so lean it was off the chart (chart stops at 22:1) i went up to 46psi id i was still lean! i went to 54psi and the motor bogged but unfortunatly the o2 kit wasnt recording (i hit the wrong button) so i dont have the data but im sure if i bogged i went rich. the point is, my optimal AFR is between 46psi and 54psi. my question is, can the stock fuel pump handle that high of a pressure with such a large injector? i still have the stock cam. i plan to go to a ford e-303 cam and a zex 75 shot kit in the future. what size pump should i get (i.e. 155lph, etc)?
should i get in line or in tank?
if i get in line, do i have to remove the factory tank pump or just disconnect the wires?
any help would be greatly apreciated

 

[emagdnim]

I have the exact same question so we need a fuel pump expert in here

 

[HISSIN50]

Sigs are great things - they help people to help you.

 

[luckythirteen13]

are you looking for more info?

mods list:
removed the air silencer
K&N air filter
C&L 76mm MAF sensor
Professional Products 70mm throutle body
Professional Products 70mm EGR spacer
Professional Products intake manifold (upper and lower)
Mac equal length shorty headers
Summit Racing catless H-pipe
Flowmaster-Delta Flow mufflers (with dumps)
aluminum underdrive pulleys (powder coated black)
Autolite platnum spark plugs
Mr. Gasket high flow 180 degree thermostat
electric radiator fan
MSD 8.5mm super conductor spark plug wires
MSD Blaster 2 (45,000volt) ignition coil
MSD 6AL ignion box
advanced timing to 14 degrees
Powerslot slotted rotors
Hawk Racing performance pads
custom shift kit
high stall torque converter
B&M transmission cooler
AFR 165 aluminum heads
Scorpion aluminum roller rockers
hardened push rods
Ford Racing 24# injectors
Trickflow 3/8" heat spacer
UMI rear upper control arms
Mega Bite Jr rear lower control arms
adjustable pinion snubber
weld in sub-frame connectors with seat support
Ford Racing 3.73:1 gears
Ford Racing 31 spline limited slip differencial
Moser 31 spline hardened axels
Torque link
smog pump bypassed
adjustable fuel pressure regulator and gauge

maybe this will help

 

[5.0fox]

lol ya i think its time for a 255 lph pump for you in the tank.

 

[luckythirteen13]

in tank... alright. what do you think of the bbk pump? its $130 and says its an oem replacement so its a direct fit

 

[HISSIN50]

BBK will likely be a Walbro pump, which is OEM (good stuff IMHO).

Good luck.

 

[5.0fox]

yea walbro's work great highly reccomended.

 

[criticman]

Just going by memory, but I believe one of BBK's pumps is an inline pump, not in tank.

Do a search on eBay...there are always brand new Walbro 255lph pumps, both in normal and high pressure forms (N/A and boosted applications), from $80-100 shipped.

That is where I plan on purchasing mine.


EDIT:
Boosted applications:
Walbro 255 LPH Part # GSS340
'85-'97 Mustang (excluding certain Cobra models) Kit Part # 400-812

N/A applications:
GCA719-2