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When changing to bigger injectors ,at some point you also need to change the fuel pump.There are a lot of aftermarket options,like walbro,Bosch,Deatschwerks ,but there are also a lot of oem options that work great.
This is what i found so far regarding oem fuel pump specs:

OEM Honda fuel pumps :
DA Integra - 108LPH@40psi, 0LPH@80psi
DC Integra - 91LPH@40psi, 0LPH@80psi
TSX - 137LPH@40psi, 68LPH@80psi
EF Civic - 114LPH@40psi, 0LPH@80psi
EG/EK Civic - 91LPH@40psi, 0LPH@80psi
FG Civic - 160LPH@40psi, 80LPH@80psi
AP1 S2K - 131LPH@40psi, 0LPH@80psi
AP2 S2K - 160LPH@40psi, 97LPH@80psi
+97 Prelude 2.2L - 160LPH @40psi , estimated ~ 40LPH@ 80psi

More info on the Civic and prelude pump are on the Hondata Website https://www.hondata.com/techfuelpump.html.

The AP2 (F22c) S2000 fuel is the best oem honda pump.You can find them used for around $50 or a new Denso aftermarket nr. 951-0005 cost around $70.
(Note: The AP2 F22C S2000 was only sold in the US and Japan.)

Other oem pumps :

-Mitsubishi EVo 9 fuel pump 190LPH Oem part nr. MN176728
Denso aftermarket nr 195130-3570

-Toyota Supra TT Denso fuel pump 315LPH
Denso aftermarket nr: 195130-1020

-Subaru Unisia JECS 02-05 WRX 130 LPH

-Subaru Unisia JECS 2005 STI 145LPH

Superstreet did a few test with these pumps http://www.superstreetonline.com/how-to ... ut-part-2/
http://www.superstreetonline.com/how-to ... -shootout/


Keep in mind that the higher flowing pumps also draw more AMPS .I highly suggest replacing the oem fuel pump wires with thicker ones.
Oem civic pumps draw around 6-8amps .The higher flowing ones draw around 9-15amps.There are fuel pump wire kits available with a relay and fuse that take power directly from the battery.

The Walbro 255LPH pump is really hard to beat it flows a lot and draws very low amps as you can see in the test superstreet did on it.
6-8amps with a flow range of 269-218LPH at a price of around $90.
IT does make more noice then a oem pump ,and i don't know how long these pumps will last.
(Not as long as oem pumps)

If you want to find Denso aftermarket parts numbers you can search in here http://densoautoparts.com/find-my-part/ ... -selection

I also highly recomend reading the Hondata article which shows you don't need a aftermarket pump unless you really making a lot of hp and/or boost.
https://www.hondata.com/techfuelpump.html. Keep in mind that Boost also rises the fuel pump pressure : for example the stock fuel pressure is 43.5psi (or 3bar) + 7psi of boost = 50.5psi of fuel pressure.So under boost the fuel pump sees higher pressure.

Another thing i found interesting are the restrictions found in the oem fueling system.
Also covered by superstreet magazine http://www.superstreetonline.com/how-to ... l-systems/


This is the exit pipe from the fuel pump. Note the diameter of the hole is smaller than the diameter of the pipe, creating a flow inefficiency.
This is done so the rubber hose will slide on easy ,this can be solved by cutting off a little of the pipe .




Another restriction we found on this '95 Civic is the fuel filter exit connector. It's too small, the area of the two exit holes from the bolt don't add up to the large entry hole.
In this case, the diameter of the intake is 6.2mm and the diameter of the two exit holes are 4.0mm. Using basic math for the area of a circle (A=pir2), we find the total area exiting the bolt is 12.5-percent smaller than the area in. A simple fix for this is to drill the smaller holes out to 4.3mm, as long as doing so won't weaken the connector.



The effectiveness of a fuel pump is highly dependent on the amount of electricity it gets. The greater the load the fuel pressure sets on the pump, the more electricity it needs.
In this '95 Civic EX, the voltage at the fuel pump is 13.49 v, while at the battery, voltage is 14.42 v. This 1v difference may not sound like much, but it means less pumping power. The electricity is lost through resistance in the wires and fuel pump relay.

Electricity is a lot like water, and it wants the biggest "pipe" possible to flow through. These "pipes" are the wires, and to get as much voltage to the fuel pump as possible, consider running thicker gauge wires to the fuel pump and possibly upgrading the relay.

Xenocron and others sell these fuel pump wire kits ,or you could make one yourself.

http://www.xenocron.com/fuel-pump-relay-p-497.html