Refer to Chapter 13 for Specifications and information on 1984 and later models i i Chapter 4 Fuel and exhaust systems i i Contents ' - ting and replacement ............................. 6 ' ' ' nt ........................ 5 Fuel lines and valves rou ' Automatic choke ' Tspjgfme: adjustme" 4 Fuel pump description and testing ............................ a l Carburetor externa aand installation... 3 Fuel pump removal and installation . ....... 1 1 Cecmrbulretor remove and overhaul ......... 2 Fuel tank - cleaning and repair .1. ............ . ........... 9 retor _ servrcmge al information .............. 12 Fuel tank description and repair warning ............... 10 as": 551:: gczrmponent replacement .................... 13 Fuel tank removal and installation .................... 1 a - ...... I I .................................................. ' Fuel ltefv removal and installation ............................. See Chapter 1 General information ............................... 1 Specications E Fuel pump Mechanical, driven from camshaft ! ype ................................... Pressure . All except inline six-cylinder engine ........................................ 3.3 to 3.3 p: ln-line six-cylinder engine ............................... . .to . . 28 seconds Volume (at idle rpm) ............................................................................ 1 mm in Torque specifications Fuel system Fuel pump retaining bolts ............................................ Carburetor retaining nuts Fuel lter-to-carburetor ........ Exhaust system inlet pipe-toexhaust manifold ................................................................ U-bolt Managed Thermactor Air (MTA) ................................................... U-bolt catalytic converterto-outlet pipe, muffler or extension pipe ............................................................................................ U-bolt inlet pipe-tomuffler without catalytic converter (Bronco and F350 cab chassis with inline 300 cu in six-cylinder engine) .................................. Bracket and insulator-toframe ............ Bracket or insulator-to-pipe or muffler General a in diameter bolt or nut % in diameter bolt or nut. g in diameter bolt or nut g in diameter bolt or nut ................................................................................. 1 General information The fuel system on all models consists of a fuel tank (or tanks) mounted in a variety of locations on the chassis, a mechanically- operated fuel pump and a carburetor, equipped with an air cleaner for ltering purposes A combination of metal and rubber fuel hoses are used to connect these three components and. in the case of some vehicles which have auxiliary tanks, 3 fuel flow control valve. which is located between the tanks and the fuel pump in the system The carburetor is a single, dual or four-venturi, downdraft type, Ft-lb See appropriate Part, Chapter 2 See appropriate Part. Chapter 2 See appropriate Pampter 2 25 to 38 A, 5 to 8 35 to 45 r ft 35 to 45 17to 24 17 to 24 12 to 17 31 to 42 50 to 70 75 to 105 depending on the engine displacement and your of production. The fuel system (especially the carburetor) in heavily interreiated with the emissions control sistem on all vehicles produced for sale in the United States. Certain modifying components of the emissions control system are described in Chapter 6. 1L 2 Carburetor servicing and overhaul 1