Fuel starvation yamaha f225 i need help

[99yam40]

not on the suction side of pump it would just suck air in.

have you looked to see if you still have air bubbles?

[marchmadness]

I didn't check to see if I still had air bubbles I was hoping that the filter gasket might have been the answer.

[marchmadness]

Questions primer ball

OK here we go I'm back on duty for the next three days and have time to think about my problem . OK true or false the primer ball function is to fill the VST with fuel? I have read this on the form . When the ball is squeezed fuel this pushed through the system into the VST tank until the float closes the inlet . So I'm thinking my problem might be one of two. First is that the pressure relief valve is staying open causing the fuel to flow in a loop not fully filling the VST tank. The fuel going through the relief might be causing the air bubbles before the lift pump . My second thought is inside the VST tank the float is getting stuck closed or close to closed and not allowing the tank to feel completely . I come to this conclusion not get an answer because when I squeeze the ball it becomes hard and it won't go anymore telling me that the system is full .

[marchmadness]

Repair

I have decided at this time to replace the pressure relief valve. I do feel that the valve is staying open causing the VST tank not to fill. I don't think I have any more air leaks and I think the air bubbles I saw in the clear hose was caused by the turbulence of the fuel going through the relief valve. I won't be able to get to this and report back until the weekend because I'm going to be away. I figured it was easier to replace the valve first before taking open the VST tank and checking the float. If anybody else has any other ideas please let me know but I will report back when I have an answer. Does anyone know how you can check the Float without opening it up?

[rodbolt17]

that 130 dollar valve is easy to test.

you can fill the VST then drain it.
I don't think you have a VST issue.

[marchmadness]

I had drained during my search for answers and I had around 9 ounces. I think the pressure relief isn't closing causing fuel to loop. Or maybe a clog causing a pressure increase .

[marchmadness]

tube size

I went to put in a new relief valve and noticed that the barb on the valve is around 3/8 and the tube that runs from the fuel line to the relief valve is smaller. That tube is no longer made am I suppose to change over to a larger size? On the right is a 3/8 tube the same size that comes off the south side of the relief valve.

[rodbolt17]

dunno.
when that motor left japan every line on it was 8mm.

[marchmadness]

I looked up the part (tube) and its no longer available. 8mm is the black fuel line on the pressure side? . what size is the light gray fuel line?

[fairdeal]

all the hose is 8mm - which is practically 5/16 and I think type B-1

I'm not understanding your photo -

are you holding a piece of aftermarket 3/8" A-1 hose ?

I wouldn't want to pay for it - but it looks like the Yamaha parts are available

the gray is used on the suction side, the black on the pressure

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[marchmadness]

The hose that I am holding was in my motor it was connected from the fuel line to the relief valveThe house on the right is a 8 mm inside diameter fuel hose that I had boughtThe diagram you show is not a 2003 spec.

[marchmadness]

On the parts it's listed as obsolete. Did something take its place. I have to check my other motor.

[Gabe Armstrong]

Have seen these symptoms, "vapor locking" in motors where ethanol is present even when it's been treated. If you are using ethanol blended fuel, stop if possible. Learned about the evil fuel several years ago, during a time when I was drag racing boats. At that time we were all trying to speed up the rpm. We removed or lighten the flywheel, used ethanol in fuel of different blends, among other tricks. We blew a lot of good engines, mostly due to ethanol. Never was able to keep the balance of octane and ethanol stable thru the run. Ethanol explodes at lower compression and lower temps than the fuel resulting in two booms in the cylinder rather than one. In short, this resulted in vapor locking, always was a problem and still will be. I couldn't believe it when they started to blend ethanol with gas and selling it at the pump.

[marchmadness]

Hose and pressure relief valve

Here goes nothing. I found a person that has used Yamaha parts. New relief valve used hose. See pictures

[rodbolt17]

the amount of BS on the net never ceases to amaze.

the reason why Ethanol and Methanol have been arbitrarily given an octane rating of 100 is because you CANNOT make it detonate.
it also takes twice as much E/M fuel to air as gasoline.
gasoline likes about 14.7 to 1 air to fuel ratio.
E/M likes about 7 to 1 air to fuel.
gasoline likes no more than about 11/1 mechanical compression.
I have seen the old 350 olds diesel blocks modified for alcohol use running 15-1 compression.

the biggest issue with E fuels is it is very corrosive.
it eats rubber and metal.
that is why it is trucked not piped.
it also absorbs water from the atmosphere.
most boat tanks vent directly to the atmosphere.

1 gallon of ethanol can hold about 12OZ of water it simply pulled out of the humidity in the air.
one gallon of e fuel contains about 12 OZ of ethanol.

see why we call the E fuel program the US govt marine tech stimulous program?

I have gotten my share of the stimulous money.