Merc 250 Verado Fuel increase

[alldodge]

Launched boat and wound up with 2 new issues. The first appears to be a slightly low Bat on the starboard motor. If keys are turned ON and each provides a single beep and it's started right away, I get 2 more beeps. It only happens with starboard and not the port. If I turn the key ON and wait for vessel view to power up it doesn't happen.

Disconnect shore power
Port Bat measures 13.2V
Starboard Bat measures 12.9V and so does the House

Bats are Group 31 Odyssey and are 1 year old, so still under warranty. Providing this in case it can also influence second problem

Problem 2
Boat came back from the dealer February this year and they said there was no issue with the port motor using more fuel than starboard. The video I provided showed about 0.2 Gph more. First run of the season and the motor kept getting worse, so much that at one time it was using 2.0 Gph more, then settled around 1.0 Gph more. At idle and running you could see and feel the motor vibrate.

Tech mate shows no codes and no history of issues since launch. This morning I had both running and switching between the 2 trying to see if there were any differences which there were none noted. This morning the port was not vibrating (missing). This afternoon I tried to connect my OTC fuel pressure gauge but while the fitting screwed on it would not stop leaking so I couldn't get a good reading. This is a fairly new OTC gauge set.

Wonder if this is a new Merc only fitting or other?

 

[muc]

For the batts, will the techmate show cranking voltage? Check check your owners manual for the battery charger, it might need to be reprogramed. That is more of a difference than I normally see. The two beeps on stbd startup might point to a voltage drop.

Same fuel pressure fitting that's been used for years. Check the o-ring in the gauge fitting, they can sometimes roll out of place and/or get pinched.

Checking fuel pressure is the next step. I would recommend checking pressure at all 4 fuel rails. Each fuel rail has it's own filter in the inlet, possible one of them got a little plugged up? Something else I might try is to do a fuel system purge using the techmate. Looking for any air in the system. Again, do all 4 test ports. Testing all 4 ports thru out the RPMs will be a pain, but may provide useful info.

Did you do the 3 year service? -- plugs, stat and fuel filter?
How is your fuel system plumbed? Do you have boat mounted fuel filters? If so, is the water in fuel sensor in the boat? Do you have the engine mounted fuel filter? Do you have manual primer bulbs? If so where are they mounted?

Fuel pressure is pretty important on these new engines.

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[alldodge]

Same fuel pressure fitting that's been used for years. Check the o-ring in the gauge fitting, they can sometimes roll out of place and/or get pinched.

Will check but I was able to tighten with fingers a good ways til it was tight and still leaked. Tighten a turn and a half more with a wrench but didn't want to go more. With it still leaking I loosened but had to use the wrench almost all the way, didn't get easier until almost full off. Afraid I might be damaging valve

Checking fuel pressure is the next step. I would recommend checking pressure at all 4 fuel rails.

The manual only shows 2 fuel rails and I only see 2 which went from top to bottom, 1 on each side

Did you do the 3 year service? -- plugs, stat and fuel filter?
How is your fuel system plumbed? Do you have boat mounted fuel filters? If so, is the water in fuel sensor in the boat? Do you have the engine mounted fuel filter? Do you have manual primer bulbs? If so where are they mounted?

No, boat has 90 hours and the 1st year it sat for for most of first year
Do not have boat mounted fuel filter
Do have engine mounted filter under the cowling
Do not have primer bulbs

 

[alldodge]

Will retry today to get the FP gauge attached.

Have placed an order for 16 plugs. Figured iridium plugs would last longer than that. Already have the fuel filters

I'm not going to replace the drive belt just yet