How,Maintain,the,Carburetor,an car How to Maintain the Carburetor and Fuel System (4)
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ControllingFuel Pressure SettingsFuelpressure should be set between 6 and 8 psi for a gasoline carburetor. Analcohol carburetor is a different animal with very different requirements. TheAlky carburetor will require 4 to 5 psi at idle and 9 to 12 psi at wide openthrottle. Remember, fuel pressure is not a substitute for volume! If the fuelbowls are not full, the pressure is meaningless. In fact, fuel pressure issimply an indication of the amount of restriction in the fuel system. Regulatorsand BypassesMostelectrical fuel pump systems require the use of a fuel pressure regulator.One regulator is sufficient in many applications. The use of two regulators isrecommended in high horsepower engines to avoid excessive fuel restriction andprovide adequate volume. With mechanical fuel pumps, and some electrical pumps,a bypass is preferred rather than a regulator. A diaphragm bypass without anidle bleed is recommended when constant fuel pressure is needed from anelectrical or mechanical pump. A belt driven fuel pump, using gasoline oralcohol, requires a diaphragm bypass with an idle bleed. Higher pressuremechanical fuel pumps delivering alcohol, such as the 15-psi BG Six-valve,require a throttle bypass to supply the variable fuel pressure required by thecarburetor. Settingthe Idle Mixture & Idle SpeedTheengine should be at optimum operating temperatures. Lightly seat the idlemixture screws, then back them out 1-1/2 turns to establish a starting point.With the engine running, slowly turn the mixture screws in or out as needed toestablish the best idle quality. Do this twice. The first time is a coarseadjustment; the second one is a final fine adjustment. Ifidle quality can't be adjusted properly, or if the idle mixture screws can't bebacked out far enough to obtain proper adjustment, it may be necessary to have theidle circuits reworked (the cam may not be pulling enough idle vacuum). Acommon reason for lack of adjustability in the idle mixture screws is havingthe primary butterflies adjusted too far open, which prevents the idle mixturescrews from being capable of controlling the idle quality. When setting idlespeed, the butterfly openings should be adjusted equally both primary andsecondary side. However, the transfer slot should not have more 0.040"exposed (viewed with the carburetor removed from the engine and turned upsidedown). Secondary adjustment is set with a screw accessible from the undersideof the carburetor. Remember,the secondary throttles should be just slightly cracked open at idle. Even oncarburetors with non-adjustable secondary idle mixture, secondary throttleposition at idle may be adjusted. It may be necessary to open or close thethrottle adjustment due to the cam design. It's a trial-and-error propositionto find the setting that gives you the best idle. However, here is a startingguideline. On engines that idle at or above 1000 rpm, start with the primaryand secondary butterflies open the same amount. For engines that idle below1000 rpm, begin with the primary butterflies open about 0.020" and thesecondary butterflies positioned at the bottom of the transfer slot. From thesepoints, begin to adjust the idle adjustment screws until the idle is steady andsmooth. Find out more about Toyota 5R carburetor by visit miparts.com.
How,Maintain,the,Carburetor,an