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Forum: General Q & A

06-05-2026, 12:15 PM

Replies: 14

1997 454 MAG MPI w/VST - Runs Perfect for Hours, Then Dies and Won't Restart. I'm Com

Views: 659

Posted By poopypenguin

Update: Found the fuel pump relay fuse blown,...

Update: Found the fuel pump relay fuse blown, replaced the fuse, boat fired right up. However I still took apart the VST to inspect, clean, and wanted to replaced the fuel pump. Found the existing...

Forum: General Q & A

06-02-2026, 09:57 AM

Replies: 14

1997 454 MAG MPI w/VST - Runs Perfect for Hours, Then Dies and Won't Restart. I'm Com

Views: 659

Posted By poopypenguin

So, the low pressure pump off the impeller is...

So, the low pressure pump off the impeller is new, the high pressure pump in the VST was not replaced or checked. Kinda why I was wondering if anyone has had experience with VST issues, such as the...

Forum: General Q & A

06-02-2026, 09:43 AM

Replies: 14

1997 454 MAG MPI w/VST - Runs Perfect for Hours, Then Dies and Won't Restart. I'm Com

Views: 659

Posted By poopypenguin

Where did you run the return line from to the...

Where did you run the return line from to the tank? from the Fuel filter hose? Did you tap into the filler neck for the gas tank? My thing about letting the pressure out is, I let the VST cool down...

Forum: General Q & A

06-01-2026, 01:47 PM

Replies: 14

1997 454 MAG MPI w/VST - Runs Perfect for Hours, Then Dies and Won't Restart. I'm Com

Views: 659

Posted By poopypenguin

I have not checked anything yet, I dropped the...

I have not checked anything yet, I dropped the boat off at the shop once I got off the lake. I will ask the mechanic to check before trying to start the motor.

Forum: General Q & A

06-01-2026, 11:13 AM

Replies: 14

1997 454 MAG MPI w/VST - Runs Perfect for Hours, Then Dies and Won't Restart. I'm Com

Views: 659

Posted By poopypenguin

There is spark when it won't start. At least from...

There is spark when it won't start. At least from the Ignition coil to the cap.

Forum: General Q & A

06-01-2026, 11:01 AM

Replies: 14

1997 454 MAG MPI w/VST - Runs Perfect for Hours, Then Dies and Won't Restart. I'm Com

Views: 659

Posted By poopypenguin

1997 454 MAG MPI w/VST - Runs Perfect for Hours, Then Dies and Won't Restart. I'm Com

Sorry for the long post, but I want to provide as much detail as possible because this issue has me, and even my mechanic, scratching our heads.

I have a 1997 MerCruiser 454 MAG MPI with a VST...

Showing results 1 to 6 of 6