Mercury 150 Efi Popular Q&A

Q: Mercury 150 efi runs then dies?
A: Start with a simple little fuel flow test. Remove the out line from the pump and pinch it closed, attach a piece of fuel line to the pump that is long enough to... Read More »

Q: '97 mercury 150 efi loss of power?
A: You need to test 3 things- compression, spark, and fuel. The first 2 are the easiest, so start there. Compression- all cylinders should above 125 psi, and withi... Read More »

Q: 1997 mercury 150 efi stalls at wot?
A: Andy. take it to a dealer and have them put it on the computer. there are a lot of things it could be. you can check the anti siphon valve in your tank and the ... Read More »

Q: How to Wire a New Key Switch to a Mercury 150 EFI.
A: 1. Remove your boat's negative battery terminal with a socket set. Set the battery cable aside. 2. Access the rear of the old ignition switch. How or where you ... Read More »

Q: How to Wire a New Key Switch to a 1996 Mercury 150 EFI Outboard.
A: 1. Unplug the motor's ignition wiring harness from the key switch you are replacing. Hold the key switch unit so that the square connector lock assembly is faci... Read More »

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