95 SuperSport Engine Question

Ok so I have done a lot of research on my problem but now I think I may have done that for nothing.

First question is does the GT40 I have, have an FCC, I thought it did but after looking a little deeper it seems it may not as in 95 I may have a different GT40 than 96+.

Now to the problem

The boat has started to stutter/hesitate after it gets warm. It could take an hour or maybe even 4 hours for it to happen but it does happen. The boat takes off normal and then around 12-14 mph it will hesitate like it isn't getting fuel or enough power to get on plane. If it does get on plane it stops hesitating until I take off again. After trying to plane a few times it will not even get over 12-14 mph.The RPMs do jump a little during the hesitation.

So most of the research I did revolved around the FCC, the hose inside the FCC, etc as a good culprit. I have checked the filter and anti siphon valve. They seem to be ok.

I just do not want to start throwing parts at this if someone else has experienced it and can help me.

Thanks

It was done before I purchased it, I have had it for 1.5 years.

I was thinking about doing one just in case it was not done. Cap, rotor, plugs, and wires.

I pulled a few plugs and the looked pretty good. Does it seem more electrical than fuel?

I was going to change both relays as well since they are only 15$ a piece.

I may just do it all one part at a time and see what fixes it, that way I know and can let others know as well. I have not ran across this problem on any other searches.

Autolite 764

Plug wires have to come from a PCM dealer. IE me or any other PCM dealer.

A little update, I changed the plugs and Dist cap/button and it is running a lot better. There is still a very small hesitation/stuttering when accelerating. Barely noticeable but since I know what I am looking for I feel it. I also tried the relays after that and there was no change. Just keeping them for spares.
Looks like I am going to do the wires next. Does this boat have a stator? Is it easy to change?   

The fuel is good as I run the boat regularly. It has never really sat for a long time either. I ran some cleaners through it as well in case it was water or dirty.

I just ordered the wires and should have them tomorrow so I will check it out and update everyone by Thursday depending on the weather.

It was bad again last night, wires still haven't shown up but should be here today. They were back ordered and I called around till I found them in stock.
I will get a gauge and check fuel pressure tonight also.

Here is a crappy video but you can see and hear what it is doing.
http://youtu.be/yIV4fJbrMk0

Mine kinda did the same change out the relays since you have them . That's whAt. I did and all good now

fuel filter . It just sounds fuel related .

not cheap, but it is usually the low pressure pump... eventually it gives out all together and you know for sure.

Very stupid question for me, in Pic 2 is that one of the pumps?

In the last pic is the small black thing a pump as well? Or a type of filter?

Where is the LP pump if neither of those are it. Looking at diagrams and confusing myself.

Thanks

Was that full throttle in your video?
If so I would stop the ignition checks and start testing the fuel pumps.
Your last pic is the low pressure pump.
Lewy posted this picture of how to jump the STO to ground which will turn on both pumps to check for proper operation.

The boat was weighted at the time so it was going a little slower. The day before we wakeboarded and was hardly any hesitation. Then last night it was back full hesitation so we dropped the weight and went home.

I guess the one in the second is the high pressure pump then? Do the non-FCC boats still have a high and a low? I saw "two stage" in the description and got confused. Sorry for any misinformation.

burban89 wrote:

your low pressure pump is in the lower right of this picture, it looks like a canister with a line coming out the top. SKIDIM has them.   

you should have 40PSI IIRC at the fuel rail (high pressure pump), but the flow comes from the low pressure pump. hesitation sounds like a fuel delivery issue, when mine went, it would not suck fuel out of the tank, so the pressure was low, but registering. I took the line off at the TBI (94-95 only) and had no flow.