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djkslc
05-28-2014, 05:16 PM
New to me 08 x2. 350 mcx, 377 hours. New fuel pump, fuel filter and spark plugs. When cold it cranks for 10 plus seconds before starting. After warm it starts fine. All the other boats I have owned start pretty quick when cold. This gives you the feeling like it's not going to start. Everyone in the boat goes oh crap like they think it's a dead boat. When I say cold, I'm talking like even 1 hour between starts. It doesn't seem right. What should I be looking for.


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Skyskiguy
05-28-2014, 09:37 PM
Who installed the new pump? Could be that your fuel pump is not holding pressure in the system after shut down - a fuel pressure gauge would tell you. Or even easier, try cycling the key on for three seconds then off several times before cranking it and see if it starts any quicker.

blackhawk
05-28-2014, 10:38 PM
djkslc - I am chasing around a similar problem. My boat was starting fine when cold, but had a rough idle until it warmed up for a minute or two. Then this weekend it idled just fine when cold, but then at the end of the day it was hard to start when hot. I wish it would at least be consistent on something.

Rent a fuel pressure gauge like Skyskiguy says. When you turn your key on without starting, you should hear your pump run and the gauge should read between 50 and 60 psi. Once the pump turns off it should still hold pressure. (Also check the gauge that you rent on a known good vehicle first. I rented three before I found one that actually worked.)

The other thing to check is the IAC (Idle Air Control). It is mounted behind the air filter. Have someone turn the key on while you hold your ear to the IAC. You should hear the IAC motor run just for a second. It is hard to hear without being right there with your ear almost touching.

Jeff d
05-28-2014, 10:51 PM
I was told the fuel system should not hold pressure on a boat once the fuel pump stops. Some coast guard regulation in order to minimize the amount of fuel that would flow into the bilge if there was a leak in the pressure line or something.

I know mine doesn't hold pressure after the key is turned off the way a car would. Turn the key off and the pressure gauge drops back to 0 pretty quickly and it starts quickly and runs fine despite this. I was testing fuel pressure a few years ago for an issue that ended up being unrelated. When I posted this thinking it was a problem a couple of people said it was normal for a boat. Research it for yourself though because nobody cited any real credible source on this.

djkslc
05-29-2014, 08:11 AM
I changed out the fuel pump, filter and spark plugs myself because of the cold start issue. I do this on all the prior used boats that I buy as preventative maintainence. I'll try the turning on and off they key trick, and I'll listen by the fuel filter.


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djkslc
05-29-2014, 11:11 PM
I've been playing with it today. That IAC does make a sound. I unplugged it and reset it. The turning the key on and off 3 times for 3 seconds does seem to help. I'll try just going back to regular starting tomorrow and see what happens.


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djkslc
06-13-2014, 07:53 PM
I took the boat to get the oil changed and have them check the fuel pressure. I'm only holding between between 40 - 50 psi. They're talking that I need a consistent 60 psi to solve my starting problem. I just changed one out. Maybe not enough psi. What fuel pump should I put in? 08 x2 with MCX.


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Jeff d
06-13-2014, 08:47 PM
I think that's right. The mcx should be around 60 psi. Iirc the older engines like mine are around 45 psi.

djkslc
06-13-2014, 10:12 PM
What's the replacement pump for the MCX? They can order one for me from mastercraft for around $650, plus a new connector for around $50. Any other options?


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djkslc
06-22-2014, 10:51 AM
A possible end to the story. I re-replaced the fuel pump with a Carter P74122 from Napa for $100. Yesterday I went and used the boat and I had about 15 starts without a sputter. Seems to have solved the problem.

mikeg205
06-22-2014, 11:04 AM
A possible end to the story. I re-replaced the fuel pump with a Carter P74122 from Napa for $100. Yesterday I went and used the boat and I had about 15 starts without a sputter. Seems to have solved the problem.

You have the in tank pump I assume? Check this thread...

common problem in that circa MC - unfortunately.