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Fuels Vol. 2 Unit 5
Automotive Dispensing Systems
| Question | Answer |
|---|---|
| what is the normal capacity of the automotive dispensing system storage tank? (235) | 10k gallons |
| what are the vent requirements for an automotive dispensing system? (235) | vent pipe normally extends above the ground level to a height of at least 12 feet |
| how far from the bottom of the automotive dispensing system tank should the line be filled? (235) | 3 inches |
| what component of the suction line prevents reverse flow? (235) | the foot valve |
| what type of pump is used when a foot valve is not required? (235) | submersible or submerged pump |
| how many storage tanks would normally be used at an automotive service station that offer MOGAS, and diesel fuel? (235) | 1 tank for each product |
| For safe dispersal of fuel vapors, a storage tank vent pipe must extend how high? (235) | 12 feet |
| What type of valve is found on the suction line, inside the tank, if the fuel dispensing units are self-contained? (235) | foot valve |
| What source of information should you use to determine the maintenance requirements for an automotive dispensing pump? (236) | The manufacturer’s maintenance manuals |
| Which self-contained unit normally uses a higher horsepower motor? (236) | The dual dispensing unit. |
| What type of electrical components are used inside automotive dispensing units? | Explosion-proof |
| Where is the fuel in the float chamber dispensed to when the float chamber is full? (236) | To the suction side of the pump. |
| Which type of dispensing system has revolutionized service station planning and has demonstrated improved service? (236) | The submerged pump. |
| The National Fire Protection Association requires what type of valve to be used with the submersible pump unit? (236) | An emergency shutoff valve. |
| What component in a submerged pump service station system prevents pressure from entering dispensers that are not being used? (236) | The hydraulic control valve. |
| Explain the difference between a single and a dual dispensing self-contained unit. (236) | The single unit has one meter and one register with a register. The dual has two meters and two register registers. |
| What is the difference between a dual-dispensing, single product unit and a dual dispensing dual product unit? (236) | The dual dispensing, dual product unit has two pumps. |
| What is the difference between the motors used in the self-contained single dispensing and the dual dispensing units? (236) | Dual dispensing motors have a higher horsepower rating |
| What should you adjust on a dispenser motor if the motor is running very slowly? (237) | the changeover plate |
| How do you prime a pump that will not prime itself? (237) | Remove the strainer cap; and, while turning the pump pulley in reverse, squirt a small amount of heavy lubricating oil into the strainer cavity. |
| How can ordinary end play be taken up on an internal gear pump? (237) | By removing the internal gear pump head and reducing the amount of gasket material. |
| Explain a safe method to thaw ice in the pump head. (237) | Use rags that have been saturated with hot water. |
| What must you do if, after you replace the pump head, the pump binds? (237) | Remove the head and add one gasket at a time until the pump is free |
| What thickness of gasket material should you use when replacing the pump head? (237) | 3/1000 inch thick. |
| What type packing should you use when repacking the internal gear pump shaft? (237) | “V” packing. |
| Which of the two valve assemblies in the supply chamber has a cork disc? (237) | The regulating valve poppet |
| What must you remove and inspect if the pump seems to stall when dispensing is stopped? (237) | The bypass valve. |
| What dispensing pump components should you check if fuel is discharged from the vent pipe located at the top of the pump? (237) | float and needle valve assembly |
| What is the cause of gasoline discharging from the vent line during extremely hot weather? How should it be corrected? (237) | The suction line from the tank to the pump is too near the surface of the ground. The suction line must be at least 18 inches underground at the pump island. |
| Which air separator parts require the removal of the entire internal gear pumping unit from the chassis when they are replaced? (237) | regulating and bypass valve seats. |
| What will happen if the air separator is plugged on a normal suction installation? (237) | This action will block off the air separator vent, causing the pump to be inaccurate |
| How much vacuum must be developed by the pumping unit to open a model 52 pressure regulator valve? (237) | At least 1 inch of vacuum |
| What should you check if the pressure regulator valve will not open on a gravity-type service station installation? (237) | Whether there is a break in the discharge line between the suction inlet of the internal gear pumping unit and the pressure-regulating valve |
| What type of meter design does the self contained pump dispensing unit use? (238) | It has its own three-piston vertical positive displacement unit. |
| How many revolutions of the dispenser meter drive shaft will equal one gallon of fuel delivery? (238) | Four revolutions. |
| Explain how to remove the dispenser meter. (238) | Break the seal wire and remove the coupling drive assembly, disconnect inlet and outlet connections; remove the four hex head cap screws and nuts. |
| What must be done to repack the drive shaft on a dispenser meter? (238) | Remove outer packing and the packing gland. Insert O-rings, seals, and seal retainers into gland recess. Now force packing into place with upper bearing and packing gland plate. |
| What usually causes a meter to bind? What can you do to help eliminate the problem? (238) | Binding is usually caused by parts becoming rusted or corroded by water or by the presence of foreign matter. Keep the measuring unit free from water as much as possible at all times. |
| What must you do before removing the wobble plate assembly? (238) | Mark the wobble plate assembly at some point. |
| Why should you not remove the valve seat from the meter body? (238) | It may cause the seat to warp. |
| What determines the correct position of the meter cover? (238) | A dowel pin in the top flange of the cylinder body and a locating hole in the cover flange |
| If the flanges of the meter do not come together, instead of forcing them, what component should you turn slightly one way or the other to align the coupling? (238) | The compensating disc. |
| Explain how to test the dispenser meters sliding vane and plungers. (238) | Push all plungers to the bottom; center the sliding valve so that it closes all ports at the same time. Holding the valve in this position, pull up on all three plungers, one at a time. |
| Which way do you turn the index disc to decrease the measurement? (238) | To the right. |
| In which direction would you turn the index disc if the meter you are calibrating reads 5 gallons but the prover can shows 5 cubic inches less than 5 gallons? (238) | To the right. |
| What would be the trouble with the register if it fails to zero or the numeral wheels do not turn during fuel dispensing? (238) | A sheared pin. |
| If the valve seat in the meter body were damaged beyond the possibility of lapping the low spots, what would be the best course of action? (238) | Install a new meter body. |
| What two things must have the proper balance so that self-contained pump units will operate efficiently and have a long life? (239) | The amount of vacuum created by the pump and the atmospheric pressure. |
| Where should the vacuum and pressure gauges be installed so that both readings can be obtained at the same time? (239) | The vacuum gauge is installed in the suction of the internal gear pumping unit, and the pressure gauge to the discharge side of the pumping unit. |
| What should the vacuum gauge read on a normal installation? (239) | 4 to 6 inches of vacuum. |
| Would the vacuum gauge read high or low if the needle valve in the air separator was not closing? (239) | Low |
| What should the pressure gauge read while the pump is running against a closed nozzle? (239) | 24½ psi. |
| What pressure gauge reading would indicate that the regulating valve was not seating properly? (239) | Zero |
| Would the pressure gauge read high or low if the bypass valve was stuck closed? (239) | High |
| What equipment should you use to tell whether the submerged pump rotor was blocked? What would be the indication of blocking? (239) | Use an ammeter. Amp readings will be three to six times higher than normal. |
| How will the ohmmeter react if the submerged pump capacitor is shorted? (239) | The ohmmeter will give zero resistance reading. |
| To check for defective motor windings, which motor leads must be disconnected? Where do you disconnect them? (239) | Disconnect the black, orange, and red leads in the extractor manifold. |
| What type of ohmmeter reading would indicate a shorted motor winding? (239) | Low ohm readings. |
| What three things could cause slow delivery from a pedestal? (239) | (1) Improper wiring or low voltage; (2) installation of automatic nozzles; (3) clogged pedestal strainer screen. |
| What causes register creeping? How can you check the cause? (239) | It is caused by pressure loss above the hydraulic valve. Check pressure loss by installing a pressure gauge at the pipe plug on the side of the control valve. Minimum pressure should be 25 psi. |
| When using pneumatic or hydrostatic pressure to test piping from the submerged pump to the island pedestals, how much pressure should you use and how long should you maintain the pressure to indicate a leak-proof system? (239) | Pressurize to 75 psi for 30 minutes. |
| What is the maximum pressure used to leak test the piping and pedestal(s)? (239) | 50 psi |
| The self-contained dispenser pump regulating valve is functioning properly when a pressure gauge is reading (239) | 18 psi one hour after the pump is turned off |
| What nozzle component creates the vacuum that operates the automatic shutoff? (240) | Check valve or pressure relief valve. |
| What occurs when the vacuum tube becomes blocked? (240) | Vacuum is sensed in the chamber diaphragm, which will raise the latch pin. |
| What must you do before removing a nozzle? (240) | Turn off all power to the dispensing unit |
| Before removing a nozzle from a dispenser with an aboveground tank, what valves should you close? (240) | The tank valves and the emergency shutoff valve |
| Where will leaks normally occur on the nozzle? What is your first course of maintenance before rebuilding or replacing it? (240) | Where it is connected to the hose, the poppet valve cover, the poppet valve stem, the chamber diaphragm, and the spout. Always try tightening first |
| Why must you be careful when replacing the O-ring on the nozzle poppet valve cover? (240) | Because of the stiff spring under the poppet valve cover. |
| What can you use to temporarily replace the automatic shutoff diaphragm? (240) | A piece of a fuel/acid resistant glove. |
| What are some of the reasons an automatic shutoff nozzle would not shut off? (240) | A loose spout or the diaphragm ruptured |
| What would you check if the automatic shutoff nozzle continuously shuts off? (240) | A blocked or broken vacuum tube; latch pin, or plunger stuck in the shutoff position; the plunger spring could be broken or stretched. |
| The AFSS provides self-service fuel dispensing without the need for what? (241) | A service station attendant. |
| What are the two types of VIRs? (241) | The Master VIR (MVIR) and the Satellite VIR (SVIR). |
| What is the purpose of the manual override switches? (241) | They override the programming functions of the VIR to permit product dispensing in the event of a lost VIL, equipment malfunction, or maintenance |
| How many selectable fuel product pumps does each master vehicle identification reader (MVIR) have the capacity to control? (241) | 8 pumps |
Created by:
Scottydick
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