Just some information I thought people would be interested in

Document ID# 685943
2001 Chevrolet Cavalier (CNG)

Fuel Gage PWM Output
PWM Output Percent Fuel¹ PWM Output²

10% 17

20% 33

30% 45

40% 52

50% 56

60% 59

70% 62

80% 64

90% 67

100% 70

¹ This is the percentage of fuel the gage will display.

²This is the PWM output required to display the percentage of fuel.




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Document ID# 429593
2001 Chevrolet Cavalier (CNG)


Fuel Pressure Sensor Output Voltage Versus Pressure

kPa (psi) Voltage

0 (0) 0.50

862 (125) 0.63

3021 (438) 0.94

5172 (750) 1.25

7331 (1,063) 1.56

9483 (1,375) 1.88

11641 (1,688) 2.19

13793 (2,000) 2.50

15952 (2,313) 2.81

18103 (2,625) 3.13

20262 (2,938) 3.44

22414 (3,250) 3.75

24572 (3,563) 4.06

26724 (3,875) 4.38

27586 (4,000) 4.54



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Document ID# 477868
2001 Chevrolet Cavalier (CNG)

Fastener Tightening Specifications
Application Specification


AF Module Bracket Bolts
24 N·m
18 lb ft

AF Module Bracket Flange Nut
9 N·m
84 lb in

Backing Plate Nuts
12 N·m
108 lb in

Coolant Line Bracket Bolts
12 N·m
108 lb in

ECU Bracket Nuts
10 N·m
89 lb in

ECU Relay Bracket Bolt
10 N·m
89 lb in

Fill Line Boot Clamps
2 N·m
18 lb in

Fill Line ORFS Fittings
37 N·m
27 lb ft

Fill Valve Access Cover Hinge Bolts
7 N·m
60 lb in

Fill Valve Access Cover Nuts
12 N·m
108 lb in

Fill Valve Mounting Nut
41 N·m
30 lb ft

Fuel Hose Clamps
2 N·m
18 lb in

Fuel Pressure Sensor (FPS)
27 N·m
20 lb ft

GDA Bracket Bolts
12 N·m
108 lb in

GMS Inlet Elbow Bolts
5.4 N·m
48 lb in

GMS/MCV to Bracket Nuts
12 N·m
108 lb in

GMS/MCV to Module Nuts
3.7 N·m
33 lb in

HPL Fuel Inlet Fitting
48 N·m
35 lb ft

HPL Fuel Outlet Fitting
27 N·m
20 lb ft

HPL PRD Fitting
48 N·m
35 lb ft

HPL to HPR Fuel Line ORFS Fittings
24 N·m
18 lb ft

HPR Coolant Inlet and Outlet Fittings
1-3 TFFT*

HPR Fuel Inlet Fitting
48 N·m
35 lb ft

HPR Fuel Outlet Fitting
1-3 TFFT*

HPR Mounting Nut
55 N·m
41 lb ft

HPR PRD Fitting
1-3 TFFT*

HPR to Fuel Line Union ORFS Fittings
24 N·m
18 lb ft

Intake Duct Clamp
5 N·m
44 lb in

LPL Bracket Nuts
12 N·m
108 lb in

LPL Fuel Inlet Fitting
1-3 TFFT*

LPL Fuel Outlet Fitting
1-3 TFFT*

LPL Bracket Mounting Bolts
12 N·m
108 lb in

LPL to LPR Fuel Line Clamp
12 N·m
108 lb in

LPL to LPR Fuel Line ORFS Fittings
24 N·m
18 lb ft

LPR Mounting Bolts
12 N·m
108 lb in

Negative Battery Cable Bolt
15 N·m
11 lb ft

PRD Line ORFS Fitting
37 N·m
27 lb ft

Relay Mounting Bolts
12 N·m
108 lb in

Spare Tire Bracket Bolts
27 N·m
20 lb ft

Tank Cover Bolts
20 N·m
15 lb ft

Tank Strap Nut
47 N·m
35 lb ft

Tank Support Backing Plate Nuts
22 N·m
16 lb ft

Tank Vent Boot Cover Nuts
6 N·m
54 lb in

Tank Vent Hose Clamps
2 N·m
18 lb in

Throttle Body Clamp
5 N·m
44 lb in

Union to LPL Fuel Line ORFS Fittings
24 N·m
18 lb ft

Upper Tank Mounting Stop Bolt
27 N·m
20 lb ft

Vent Boot Clamp
2 N·m
18 lb in