Section 5
FUEL PUMP BOOST REFERENCE
5-1
P/N: 4PFX020-010
©2007 Paxton Automotive
All Rights Reserved, Intl. Copr. Secured
26JAN07 v2.1 UnivSBFCarb(4PFXv2.1)
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 mechani-
cal 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 remain-
ing 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 sup-
plied hose clamps on all connections.
Fig. 5-a
