Section 8 — Fuel and Exhaust
Fuel Systems
Due to the critical nature of sealing the fuel system, anyone making modifications or alterations to the existing system must assume
complete responsibility for the system reliability, performance and compliance to FMVSS 301.
The fuel evaporative emission control equipment is certified to be in compliance with the Federal and California Vehicle Emission Standards.
Any alterations to systems or components and their location could void compliance. System includes:
• Fuel tank, metering unit, lines including purge control solenoids and canister or canisters.
For these reasons, NO ALTERATION OF THE FUEL SYSTEM IS RECOMMENDED.
Fuel Lines
Fuel line routing precautions:
• 12 in. minimum clearance to exhaust system is required or a metal shield must be provided.
• Fuel lines should be clipped to chassis to prevent chafing. Metal clips must have rubber or plastic liners.
• Use corrosion resistant steel tubing with short sections of approved hose to connect components. Hose-to-tube connections
should be clamped for diesel systems. Steel tube ends should be beaded for hose retention. Fuel supply is pressurized by an
in-tank pump for PFI and SCPI systems. Coupled hose or nylon quick-connects must be used. Clamped hose is not acceptable
for PFI and SCPI systems.
All engines require a fuel return system which returns excess fuel from the injection pump and injector nozzles back to fuel tanks. Care should
be taken that these lines are not blocked nor their hoses pinched. The engine may run poorly or stall if these lines are restricted or blocked.
All gasoline engine vehicles are equipped with fuel evaporative emission control equipment which is certified to be in compliance with the
Federal or applicable California vehicle emission standards. Alterations to fuel tank and metering unit, lines, canister or canisters, canister
filters, canister purge control valves, relay switches, tank auxiliary vent valve, engine speed controller, or other devices/systems are therefore
not allowable since vehicle adherence to C.A.R.B. and Federal regulations may be affected.
Diesel powered vehicles incorporate water drain provisions in the fuel system. These valves are only to be opened when siphoning water
and contaminants from the fuel system.
S/T SMALL UTILITY – SUV
(
C
HEVY BLAZER & GMC JIMMY
)
S/T Small Utility – SUV 2004
8
PAGE
(Section 8 — continued on next page)
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