u4 needs
breakdown device Two battery-operated red-light flashing beacons or two red reflective
devices must be carried in the vehicle as breakdown safety devices. Reflective
devices must be at least 12†high and 12†long and be free standing (similar
to trucker’s breakdown triangles
check first aid kit
Front / side/ rear numbers
weight 4400lbs
Gussets must be installed at all major intersections, including diagonal and
rear down braces, where single weld fractures can affect occupants’ safety.
Gussets constructed of 3†x 3†x .125" flat plate or split, formed and
welded corner-tubing, or tubing-gussets made of the same material and
thickness as the roll cage may be used.
Each vehicle shall have a means of applying continuous brake pressure while
vehicle is parked with occupant(s) outside the vehicle. Hydraulic “line-locksâ€
or mechanical “emergency brakes†are permitted.
There must be a substantial cross member and firewall between the fuel
tank and the occupants
Internal baffling is mandatory in all
fuel cells. Foam is an acceptable form of internal baffling
Fuel isolation valves that facilitate isolation of the fuel tank from the fuel supply line, fuel return line,
and fuel vent line are required. Ball valves, or a combination of ball valve
and one-way check valve, located at the supply, return, and vent line are
acceptable.
Fuel tank must be filled from, and vented to, the outside of the
occupants' compartment.
All fuel fillers attached to the frame or a body panel must be connected to
the tank using flexible couplers. Boot or splashguard must direct fuel spillage to outside of vehicle and away
from occupants’ compartment, engine, and exhaust. A fuel filler roll over or check valve must be incorporated in the cell.
Fuel vent lines must have a rollover check valve incorporated at the fuel
cell, and must vent outside of occupants’ compartment, and be directed
away from the engine and exhaust system.
6.2.14.3.7 Fuel vent line must use one of the following routings:
6.2.14.3.7.1 Fuel vent line must extend to the highest point of the roll cage
nearest the fuel cell, across the width of the vehicle, and down to below the
belly pan of the vehicle or 3†below the fuel cell, whichever is lower.
6.2.14.3.7.2 Fuel vent line must loop above the fuel cell to a point that is 4†above
the top of the fuel cell. From there it shall be wrapped one full loop around
the outside of the fuel cell near the top of the fuel cell and then be routed
down to a point 3†below the lowest point of the fuel cell.
Fueling mat
