2002 Excaliber 330 flooding when fuel tank is full.

[Michael James]

When fuel tank is full the engine after started and run for awhile tends to flood when I try to start it. I have to do the full throttle thing to get it to start. Any ideas why this would be? Does not seem to do it when fuel tank is 3/4 full or below...Thanks for any input!

[NautiqueJeff]

Very weird for a FI boat to do that.

In fact, I am not sure that I have ever heard of anything like that on a boat without a carb.

I have never had to advance the throttle on any of the FI engines in order to start the boat.

Leaking injector, possibly?

[distinguishedmotorsports]

Very weird for a FI boat to do that.

In fact, I am not sure that I have ever heard of anything like that on a boat without a carb.

I have never had to advance the throttle on any of the FI engines in order to start the boat.

Leaking injector, possibly?

seconding above, does the boat smell like fuel behind it while starting/pulling?

[Speedy]

Hmmm, fuel starvation only at full tank down to 3/4 tank... A few possible things come to mind.
I have been helped many times on this forum and I get excited when I may be of any help.
Please excuse my grammar and spelling. I am horrible at it.

1. Fuel pressure regulator.
2. Plugged or clogged check valve at fuel tank.
3. Weak fuel pump.
4. Having a leaking fuel injector will also cause a misfire on that particular cylinder.

REGULATOR
1. While the engine is running you can unplug the vacuum hose to the fuel pressure regulator and check for fuel leaks out of the regulator. The second test done on the regulator can be done with a fuel pressure gauge.
After installing a fuel pressure gauge and turning the ignition switch ON:
A. The fuel pressure should NOT exceed 40psi.
B. With the engine running it should HOLD at 40psi
C. With the engine running and the vacuum hose disconnected and plugged, the fuel pressure should DROP to about 30psi. No less.

CHECK VALVE
2. Visually inspect fuel hoses, clamps and the valve itself. If you have a vacuum pump, you can apply vacuum to it and it should hold. You can sometimes blow into it to see if air passes through. It should only flow one way.

FUEL PUMP
3. I would start by checking fuel pressure with a fuel pressure gauge. It should be 40psi on this Multiport injection engine. This should be done with the ignition switch on right after energizing the relay. It should hold and not drop past 38psi. By the way the relay will energize for five seconds after turning ignition switch on.

I hope this helps you some.


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[Michael James]

seconding above, does the boat smell like fuel behind it while starting/pulling?

No, I do not smell fuel.

[Michael James]

Hmmm, fuel starvation only at full tank down to 3/4 tank... A few possible things come to mind.
I have been helped many times on this forum and I get excited when I may be of any help.
Please excuse my grammar and spelling. I am horrible at it.

1. Fuel pressure regulator.
2. Plugged or clogged check valve at fuel tank.
3. Weak fuel pump.
4. Having a leaking fuel injector will also cause a misfire on that particular cylinder.

REGULATOR
1. While the engine is running you can unplug the vacuum hose to the fuel pressure regulator and check for fuel leaks out of the regulator. The second test done on the regulator can be done with a fuel pressure gauge.
After installing a fuel pressure gauge and turning the ignition switch ON:
A. The fuel pressure should NOT exceed 40psi.
B. With the engine running it should HOLD at 40psi
C. With the engine running and the vacuum hose disconnected and plugged, the fuel pressure should DROP to about 30psi. No less.

CHECK VALVE
2. Visually inspect fuel hoses, clamps and the valve itself. If you have a vacuum pump, you can apply vacuum to it and it should hold. You can sometimes blow into it to see if air passes through. It should only flow one way.

FUEL PUMP
3. I would start by checking fuel pressure with a fuel pressure gauge. It should be 40psi on this Multiport injection engine. This should be done with the ignition switch on right after energizing the relay. It should hold and not drop past 38psi. By the way the relay will energize for five seconds after turning ignition switch on.

I hope this helps you some.


Sent from my iPhone using Tapatalk

Oh Wow, thank you for the detailed response, much appreciated! I have some homework here to do, I'll let you know what I find out.