B&M FUEL PRESSURE GAUGE User Manual

Installation Instructions

Fuel Pressure Gauge Set

Honda Civic/CRX/del Sol

Acura Integra/NSX - Eagle Talon

Mitsubishi Eclipse - Plymouth Laser

Part Number 46054

©2000 by B&M Racing and Performance Products

The B&M Fuel Pressure Gauge Set
has been designed to work on all late
model Honda Civics/CRX's/del Sols,
Acura Integras/NSX's, Mitsubishi
Eclipses, Eagle Talons & Plymouth
Lasers.
The B&M Fuel Pressure Gauge Set
allows the user to accurately measure
fuel pressure. When used in conjuction
with the B&M CommandFlo Fuel
Flow Modifier, the user may
accurately adjust fuel pressure to
compensate for engine modifications.
Most factory computers will
compensate for minor airflow
modifications (low restriction intake
and exhaust) at part throttle operations
but have no way to adjust at WOT
(Wide Open Throttle). The results are
a lean mixture right where you need
more fuel! One way to correct this is
to adjust fuel flow via fuel pressure.
Most people don't understand that by
increasing fuel pressure (on a fuel
injection system), fuel flow increases.
The formula for calculating flow
increase based on fuel pressure is:

F1 = Injector Flow (cc/min)
P1 = Current Fuel Pressure (psi)
F2 = New Injector Flow (cc/min)

P2 = New Fuel Pressure (psi)

P2 = P1 x

Example:

You've added a high flow exhaust
that increases airflow 10%. What
pressure should the system be set
to?

F1 = 270 cc/min
F2 = 297 cc/min (270 + 10%)
P1 = 43 psi

P2 = 43 psi x

or

P2 = 52 psi

The B&M Fuel Pressure Gauge
Set requires the user to assemble

the gauge to the banjo bolt (and 90°
fitting depending on application).
Since the gauge and fitting are con­nected with a 1/8" NPT (National Pipe
Thread), please use a pipe sealer
such as Teflon® to avoid possible
fuel leaks. The connection between

( )

INTRODUCTION

2

F2
F1

297

( )

270

2

the fitting and the fuel line requires no
sealer since they employ washers.

INSTALLATION

The fuel pressure tap on the late
model Honda Civic/CRX/del Sol,
Acura Integra/NSX, Mitsubishi
Eclipse, Eagle Talon & Plymouth
Laser is located on top of the fuel
filter which is mounted on the pas­senger side firewall (driver's side
for the NSX). We suggest the ve­hicle be allowed to cool for a while
before you begin since you will be
working around the fuel system.

CAUTION: THE FUEL SYSTEM
CONTAINS FUEL UNDER HIGH
PRESSURE EVEN WHEN THE
ENGINE IS NOT RUNNING. BE­FORE DISCONNECTING A FUEL
LINE, WRAP THE FITTING WITH
A RAG TO PREVENT FUEL
SPRAY.

Remove the fuel pump fuse from
the fusebox. Try starting the ve­hicle several times until it will not
remain running. This will help re­lieve pressure in the fuel system

Printed in the U.S.A.

9500666-04

(NOTE: For some vehicles it may
be helpful to remove the battery).
Place a towel around the top of the
fuel filter. Remove the banjo bolt
assembly (be careful of spraying
fuel!). See Figure One. Replace
the top washer with the supplied
copper washer (Note: If the bot­tom washer is damaged it must be
replaced with Acura p/n 90428­PD6003 or Mistubishi p/n
MB906711. Install the fitting as­sembly with the copper washer,
banjo fitting (fuel line) and stock
washer into the fuel filter (See
Figure Two). Tighten to 16 ft-lb.
When installing the gauge, you
have the option of mounting the
gauge face up (as shown in Fig-
ure Two) or face sideways by
using the supplied 90° brass fit­ting. Make sure to use Teflon tape
(not supplied) on the fuel pressure
gauge threads (and 90° fitting, if
applicable), then either screw the
gauge into the banjo bolt or 90°
fitting. Tighten the gauge to 10 ft­lb while using a backup wrench on
the banjo bolt or brass fitting. DO
NOT OVERTIGHTEN! If you used
the 90° fitting, screw the fitting\gauge
assembly into the banjo bolt. Tighten
the 90° fitting to 10 ft-lb while
using a backup wrench on the banjo
bolt. DO NOT OVERTIGHTEN!

Note: Carefully lower hood (with­out fully closing) and check for
sufficient clearance between the
top of the gauge and the hood.

Reinstall fuse. Start engine and
check for fuel leaks.

Fuel Pressure
Gauge

(Apply Teflon Tape)

Remove

Replace

Figure One

or

90° Fitting

Banjo Bolt
Assembly

Stock Washer

Banjo (Fuel Line)

Stock Washer

Fuel Filter

Fuel Pressure
Gauge

(Apply Teflon Tape)

Brass Fitting

Copper Washer

Parts List

1 Fuel Pressure Guage, 0 - 100 psi
1 Brass Banjo Bolt
1 90° Brass Fitting
1 Copper Washer
1 Instruction Sheet

Banjo (Fuel Line)

Stock Washer
(replace if dam­aged)

Fuel Filter

Figure Two