Advance Adapters 713093 - Manual (Page 6)

Fuel System:
Refer to the fuel section of your Jeep owner’s manual before servicing or taking apart
any piece of the fuel system. Special fittings, pressurized line, and certain procedures
must be taken into consideration before work can be done on the fuel system.
Do not
take short cuts on fuel systems. The new Vortec Gen. III fuel rails have anywhere
between 50-60 pounds of fuel pressure! Only approved high pressure hose and fittings
should be used. Take care when routing fuel lines, and make sure all fittings are secure.
The new Vortecs need a minimum diameter of 3/8” line on the pressure side, and a
minimum of 5/16” on the return (3/8” is best for the return line). The stock Jeep fuel
pump comes close to feeding the new block, but falls short. The stock Jeep fuel pump
is internally regulated in the fuel tank at 46 psi. The Vortecs regulate at 56 psi on the fuel
rail. Since the Jeep regulated the pressure at the tank, it did not run a return fuel line.
We opted to run two new 3/8” lines, one pressure and one return. The pressure line
needs to be installed by drilling and installing a bulkhead-type “AN” fitting alongside the
stock Jeep pump assembly. A fuel tank pick up must also be installed. Make sure the
new pick up line draws from the bottom of the tank and has no restrictions. The old
Jeep “pressure” line out of the tank can be used as a return line connection from the
Vortec. To use this connection you must take all the “guts” out of the stock internal
regulator. The photos on this page show the modifications we did.
So we basically abandoned the stock Jeep fuel tank pump and used a in-line after market
fuel pump to provide the correct pressure. Note newer GM engines today do not
require a fuel return line, so the information will vary depending on the year of Vortec
engine obtained.
The 2005-06 Jeep TJ and LJ fuel tanks and fuel pumps do offer the correct fuel pressure
and hose size, and are the most recommended for this conversion
ADVANCE ADAPTERS INC. P/N: 713093
P.O. Box 247, 4320 Aerotech Center Way
Paso Robles, CA 93447
PAGE: 6 OF 6
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 08-18-10
SPECIAL NOTE: The components packaged in this kit have been assembled and machined for specific type of conversions. Modifications to any of the
components will void any possible warranty or return privileges. If you do not fully understand modifications or changes that will be required to complete your conversion,
we strongly recommend that you contact our sales department for more information. This instruction sheet is only to be used for the assembly of Advance Adapter
components. We recommend that a service manual pertaining to your vehicle be obtained for specific torque values, wiring diagrams and other related equipment.
These manuals are normally available at automotive dealerships and parts stores.
VORTEC GEN. III V8 SQ. BOLT
TJ WRANGLER MOTOR MOUNTS (WITH A/C)