Mercury V8 250 User Manual

1 - Fuel injector 1
2 - Fuel injector 2
3 - Fuel injector 3
4 - Fuel injector 4
5 - Fuel injector 5
6 - Fuel injector 6
7 - PCM connector A
8 - Fuel supply module
9 - Fuel pump relay
10 - Main power relay
11 - Hot stud
12 - Fuse holder ‑ three 20‑amp fuses shown
13 - Chassis ground
Connector Pin Wire Color Function PCM
65694
A
B
A Red/orange Fused (20 A) 12 V power (+) –
B
Pink/brown Fuel injector 1 AF3
Pink/red Fuel injector 2 AD1
Pink/orange Fuel injector 3 AF4
Pink/yellow Fuel injector 4 AF1
Pink/blue Fuel injector 5 AE1
Pink/purple Fuel injector 6 AF2
53172
B
A
A Pink Fuel pump 12 V power (+) –
B Black Chassis ground (–) –
86
87
85
30
59637
30 Red/pink Fused (20 A) 12 V power (+) –
85 Yellow/black Fuel pump relay (FPR) control AB4
86 Red/blue Fused (20 A) 12 V power (+) –
87 Pink Fuel pump 12 V power (+) –
Hot stud ring terminal 30 Red 12 V battery power (+) –
MPR 86 Yellow/purple Main power relay (MPR) control signal AA2
MPR 87 Red/white Switched 12 V power (+) –
Troubleshooting and Diagnostics
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 7B-7

Mercury V8 250 Specifications

General

Engine Type	V8
Horsepower	250 HP
Displacement	4.6L
Fuel Induction System	Electronic Fuel Injection (EFI)
Steering	Hydraulic Steering
Gear Ratio	1.75:1
Cylinders	8
Starting	Electric Start
Full Throttle RPM Range	5200-6000 RPM
Alternator Amp	85 amp
Shaft Length	25 in
Weight	527 lbs
Fuel Type	Unleaded 87 octane minimum