Fuel issues - Maxum Boat Owners Club

MaximusBoatimus · 10-10-2019, 01:37 PM

Hey all,

Have a 99 maxim, with 2, 305 5.0's, recently went to start stb motor and nothing, engine turns over but will not successfully start. The boat sat this summer in water didn't really change out the gas at all. I tried cleaning up the carb with 2+2, she seemed to take to it and it turned over shortly there after only to die.

Grabbed starter fluid and was able to have to engine turn over and run for round a minute with constant sprays. So I'm led to believe it's not getting fuel. I tried to locate the fuel pump which to me just looks like a long cylinder.

I've been trying to find videos with some instructions but have been running in circles at this point. Any help would be wonderful.

Thanks all

mmwjr · 10-10-2019, 02:55 PM

That long cylinder is an electric fuel pump. It gets power from the starter solenoid when starting and once started there is a oil pressure switch that closes and provides power. If it starts and runs for a minute then dies the oil pressure switch is the issue.

MaximusBoatimus · 10-10-2019, 03:00 PM

Thanks for the reply.

I meant when spraying the starting fluid into the carb I was able to get it to run for about a minute. Once I stopped spraying the fluid it died seconds thereafter. I believe there's just no fuel getting to the carb.

mmwjr · 10-10-2019, 04:38 PM

Try disconnecting the fuel line from the carb and crank the engine to see it any fuel comes out. Try to catch it in a container. You can also swap fuel pumps between the two engines to see what happens.

MaximusBoatimus · 10-14-2019, 11:16 PM

Quote:

Originally Posted by mmwjr

Try disconnecting the fuel line from the carb and crank the engine to see it any fuel comes out. Try to catch it in a container. You can also swap fuel pumps between the two engines to see what happens.

I took the fuel line off, was on pretty good actually. Nothing, used a power probe to see if it would do anything. Could feel the click of it turning on but nada. Tried adding fuel thinking maybe the gauges were wrong. Nope dead fuel pump thanks for the help! I have to order to part. 360 and a week for shipping. Ugh

mmwjr · 10-14-2019, 11:57 PM

Let us know how it runs with the new pump.

danaoverman · 06-07-2022, 05:05 PM

Do you have a part # for the fuel pump? i have a 2002 2500SCR. also the fuel pressure switch?

mmwjr · 06-07-2022, 07:07 PM

Quote:

Originally Posted by danaoverman

Do you have a part # for the fuel pump? i have a 2002 2500SCR. also the fuel pressure switch?

What’s the serial number of your engine?