R Fuel Pump Canister and Strainer
R Figure 008A (SHEET 2)
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Fuel Pump and Canister - Details Figure 009 (SHEET 1)
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Fuel Pump and Canister - Details Figure 009 (SHEET 2)
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R Fuel Pump and Canister - Details
R Figure 009A
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**ON A/C 301-399,
The canister has two primary fuel outlets. The one outlet contains the outlet valve and is the fuel supply to the engine feed pipe. The other outlet is the fuel supply to the jet pump. A small opening in the side of the canister connects the pressure from the fuel pump to:
-
the related pressure switch
-
the recirculation system (Ref. 28-16-00).
**ON A/C ALL
The primary components of the outlet valve are:
-
the inlet body
-
the outlet body
-
the valve seat
-
the valve assembly.
The inlet body of the outlet valve connects to the fuel pump canister outlet and an O-ring seals it. The inlet body includes the valve seat which seals the poppet-type valve assembly (installed in the outlet body). The valve assembly has:
-
the spider assembly
-
the valve head
-
the spring.
The spider assembly has four legs with a spindle through the center. Each leg contains a steel ball which is held in place with a small spring. When the valve is closed, the four balls locate in a recess on the spindle.
When there is no fuel pressure, the spring holds the valve head against the valve seat. If the fuel pressure increases (but is less than a specified value) the force of the spring on the valve head (plus the force of the balls on the spindle) does not let the valve open. When the fuel pressure is more than 2.5 psi (0.17 bar) it pushes the valve head off its seat. The fuel then flows through the valve.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
B. Fuel Pump Element 21QA(22QA) 25QA(26QA) 37QA(38QA)
(Ref. Fig. 009)
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B. Fuel Pump Element 21QA(22QA) 25QA(26QA)
(Ref. Fig. 009A)
**ON A/C ALL
The fuel pump element has:
-a rotor assembly
-
an impeller assembly
-
an inducer assembly
-a shaft
-three thermal switches.
The pump element is assembled vertically. The rotor assembly is at the top. The impeller assembly is in the center and the inducer assembly is at the bottom. The shaft connects the three assemblies together.
The rotor assembly is a 3 phase 115VAC electrical motor. When energized it turns the shaft and the impeller and inducer assemblies. The inducer makes a suction that causes fuel to come through the impeller assembly. The impeller assembly pressurizes and pushes the fuel out of the canister. The three thermal switches are in the electrical circuit of the fuel pump element. If the temperature of the pump element increases to more than 175 deg.C (347 deg.F) the switches operate. This causes the pump element to stop. It cannot operate again and must be replaced.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
C. Fuel-Pump Pressure Switch 23QA(24QA), 27QA(28QA), 39QA(40QA)
(Ref. Fig. 010)
**ON A/C 301-399,
C. Fuel-Pump Pressure Switch 23QA(24QA), 27QA(28QA)
(Ref. Fig. 010A)
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Main Pump Pressure Switches
Figure 010
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Main Pump Pressure Switches
Figure 010A
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**ON A/C ALL
The primary components of the fuel-pump pressure switch are the body and the banjo adapter. The body contains:
-
a flexible diaphragm
-
a switch mechanism
-an electrical microswitch.
The flexible diaphragm isolates the switch mechanism and the microswitch from the fuel. When the fuel pressure increases to 0.55 bar (8 psi), the flexible diaphragm moves to operate the switch mechanism (which opens the contacts of the microswitch). When the fuel pressure decreases to 0.41 bar (6 psi), the flexible diaphragm moves (in the opposite direction) to operate the switch mechanism and close the contacts of the microswitch.
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