Systems Repair Worksheet

Systems Repair Worksheet Chapter 29 Pages 875-898 Name

Fuel Delivery Systems 40 Points Due Date

1. A ______ReturnRerunReturnless - type of fuel delivery system uses an electric fuel pump in the tank to deliver fuel

under pressure to the injectors and a pressure regulator mounted on the fuel rail.

2. A return-type of fuel system has a ______ReturnRerunRelease ______LineSplineVane

from the fuel rail back to the tank.

3. A ______ReturnRerunReturnless - type of fuel delivery system,

the pressure regulator is in the tank so there

is no need for a fuel return line. This keeps fuel cooler

eliminating evaporative problems.

4. Fuel system problems can be fuel ______FreaksLeaksGeeks,

fuel smells (vapor leaks), inadequate fuel supply

causing lean A/F mixtures or a no-start condition,

or excessive fuel pressure and rich A/F ratios.

5. The fuel system can be grouped into 1) fuel ______DeliveryPumpingRecirculation & 2) fuel ______InjectionRejectionDetectionReflection sections.

6. A vehicle with driveability problems should be checked for stale & ______ContaminatedRestrictedImported fuel.

7. Both liquid & vaporized fuel poses safety problems. Always release ______ResidualReactiveRegenerative pressure

before opening fuel lines, wear eye protection, have a fire extinguisher nearby and remove all

electronic devices, including cell phones from your clothes when working near the system.

8. Fuel tanks have a vapor dome at the top and a non-vented _____CapFilterPump to prevent escape of fuel vapors.

9. Fuel tanks can be steel, aluminum, or ______PolyethylenePolyeurethanePolypropylene plastic & have internal slosh ______WafflesBafflesTruffles

or surge plates to slow the fuel movement. A fuel filler neck anti-surge restrictor is used to prevent spills.

10. A ______LiquidMetalRust ______VaporChemicalSolid separator prevents liquid fuel from reaching the vapor storage canister.

11. The fuel tank ______PendingSendingLending ______UnitChapterBook includes a pickup tube, float operated gauge sender unit, a

fuel strainer or filter sock and the fuel pump.

12. Best practice for servicing damaged or corroded fuel tanks is full replacement. True False

13. Fuel ______FillerConatinerRetainer caps are non-venting with some type of pressure-vacuum relief valve arrangement.

14. Caps are often tethered to the vehicle, and are designed to prevent ______OvertighteningLooseningTheft. (click x3)

15. A loose gas cap can cause an EVAP system malfunction & illuminate the MIL. True False

16. Enhanced EVAP systems have a Fuel Tank ______StressPressureVolumeLevel sensor (FTP) used to determine if

The system has evaporative (vapor) leaks by monitoring fuel tank pressure.

17. The gas cap can be pressure/vacuum tested to see if it is the source of leaks. True False

18. Systems may have a capless tank with a spring-loaded ______FlipperDipperFlapperClapper valve instead of a threaded cap.

19. A variety of materials are used for fuel lines with a variety of fittings, including the ______QuickProblemRustedTerrible-

disconnect, compression, flared, double-flared, ISO o-ring and the push-connect type.

20. Fuel ______PumpsLinesInjectorsFilters, if located in the fuel line between the tank and the engine, should be usually

replaced as part of a tune-up and suspected of restriction if fuel pressure & volume is below specs.

21. Rotary ______MechanicalVacuumChemicalElectric fuel pumps are submerged in the tank to keep them cool, quiet, & to keep

the motor armature & brushes away from oxygen which could support combustion in the tank.

22. Gas engine fuel pressure is under 50 psi. Diesel engine fuel pressure can reach ______1,00010,00026,00050,000 psi!

23. Fuel pumps will ‟de-power” if the CKP signal is not present for ___220200 seconds.

24. Some systems use ______PulseDutyEnergy - ______WidthCycleLength modulation to control fuel pump output. (F.P. driver module)

25. The PCM and a fuel pump ______RelayFuseBreakerFuse Link are part of the power supply circuit on many vehicles.

26. Fuel systems also have a rollover valve and possibly an ______InertiaMomentumVelocityViscosity switch

to shut off the fuel pump in case of a vehicle collision or rollover.

27. To automatically de-power the fuel ______PumpFilterInjector in the even to of a collision,

it is tied to the passive restraint system (SRS) through the CAN bus.

28. Fuel ______PressureReactanceResistanceForce and volume of fuel flow can be tested at the Schrader valve on the fuel rail.

29. High pressure usually indicates a faulty fuel pressure ______RegulatorModulatorEmulatorDefibulator or an obstructed return line.

30. Low fuel pressure can be due to a clogged ______FilterSockSenderCooler, restricted line, weak ______PumpInjectorRelay, leaky

fuel pump check valve, a defective pressure regulator or even a dirty filter sock in the tank.

31. Poor starting due to lack of ______ResidualReactiveResidential pressure in the system could come from a leaky

injector, a fuel pump residual check valve, or a pressure regulator that is leaking.

32. When fuel volume of flow is being measured, one ____PoundPintGallonOunce of flow in 30 seconds is the normal spec.

33. A ____StabBlabCrabLab ______ScopeRopeSlopeElope to monitor fuel pump voltage pattern and a DMM with an ______ConductiveInductiveDeductive

amps clamp are typically used. Excessive current draw means the armature is turning slower.

34. During no-start diagnosis, ______TasteFeelTouchListenSmell for fuel pump noise & check fuses first.

35. Fuel pumps are controlled by relays & may also have the ______R-134aOilCoolantBrake pressure switch in their circuits.

36. Fuel pump replacement usually entails removing the fuel ______RelayFuseBreakerTank. It should be properly emptied

before loosening the straps to lower it. Use caution since open tanks are extremely flammable!