P/N: 4PFX020-010
©2004 Paxton Automotive Corp.
All Rights Reserved, Intl. Copr. Secured
28JUL04 v1.2(Univ.SBF Carb-4PFX v1.2)
Section 5
FUEL PUMP BOOST REFERENCE
5.1 FUEL PUMP BOOST REFERENCE
Some kits come with a boost referenced fuel pump. For
these kits, simply install the fuel pump and complete
steps E to G.
*** NOTE ***
A stock fuel pump may be satistactory for mild engines.
The following steps will allow the mechanical pump to
increase fuel pressure in proportion to boost
pressure.(I.E.: stock fuel pressure = 5 psi @ 0 psi boost
/ supercharged fuel pressure = 12 psi @ 7 psi boost.) If
fuel pressure is not maintained at least 4 psi above
boost pressure, replace the stock fuel pump with a
higher flow unit. (Paxton P/N: 8F001-120.)
A. Remove the fuel lines from the fuel pump.
B. Remove the fuel pump.
C. Drill and tap the vent hole located in the side
of the fuel pump. 1/16 NPT, use Ø.246 drill
before tapping. Install a 1/16 NPT to 3/16
hose barb fitting (P/N: 7P062-187) into the
tapped hole.
*** NOTE ***
If the fuel pump has two vent holes, plug the remaining
hole with a pipe plug.
D. Re-install the boost-referenced fuel pump.
E. Attach the supplied vacuum hose to the barb
fitting on the fuel pump. (See Fig. 5-a.) The
other end of this hose will later be connected
to the carburetor enclosure.
F. Re-attach the fuel supply line.
G. Attach the supplied 3/8" fuel line from the fuel
pump outlet to the fuel filter and then route up
to where the carburetor enclosure will be
installed. Install and tighten the supplied hose
clamps on all connections.
Fig. 5-a / Stock fuel pump, others similar.
5-1
