GT-40 loses fuel pressure after starting when hot and after sitting for an hour

[slmskrs]

dismantled, cleaned, and re-assembled

Thanks Daniel. I pulled it apart, pulled out the screen (only a few specs of dirt; almost completely clean). While I was cleaning the pump with carburetor cleaner, one of the pump vanes fell out. I looked at the edges to see which way it goes back in. It appears that the edges are chamfered at both sides, so I dropped it back in and closed it up. Tomorrow evening I'll put it back in, connect up everything, jump the pump, and run it (hopefully with no leaks).

I know the dangers of gas fumes. We were jumping an older Nautique with a dead battery. It was turning over slowly but not firing. Unbeknown to us, there was enough power to slowly turn the engine over, but not enough to fire the plug. After cranking it many times (with lots of gas fumes flowing through the engine and into the exhaust system), we finally hooked up a charged battery, turned it over, and blew the side off the fiberglass muffler. Scary!

You do use a wrench to snug the bolts holding the top plate on the pump, but go easy.

There is not a third pump. What you are hearing is an anti-siphon valve on the top of the tank, in the hose that feeds fuel to the engine.

In most direct drive Nautiques, the gas tank sits on the floor of the boat, and the low pressure fuel pump is below the floor. If the hose from the tank to the fuel pump ever got a leak, it would just siphon gas into the bilge.

I just got the digital camera, from Costco, about three weeks ago. Gave them two one hundred dollar bills, and they gave me the camera, and three pennies. It came with a USB cord, to connect to my computer, and a cord with a red, white, and yellow RCA connector that hook up to the TV. It is a Panasonic DMC-ZS6. It really takes much better pictures than my cell phone did, and I no longer have to get film pictures developed, and put on a CD. It will also do short videos, and has a 12X optical zoom. I have not tried it yet, but I think is to going to zoom enough to get good pictures at "waterski rope lengths".

[slmskrs]

low pressure pump back in, no flow, but low tank level (pump isn't self priming?)

I put the low pressure pump back together, reinstalled, and tried it. However, there was no flow. There is only about 4 gallons of gas in the tank. The pump height mounted on the engine is higher than the tank bottom, so I'm not getting any flow.

I assume the low pressure pump is not self priming. Last year I ran out at the pond. Someone brought about 4 gallons in a can, but it still wouldn't start. I had to take the boat to the gas station and fill it up. It then started with no problem. If the low pressure pump is supposed to be self priming, it has a problem. If not, I'll just have to put some gas in the tank to get it high enough to flow. Then I can test to see if it is working properly after the reassemble. I'll then just need to take it to the pond and try to duplicate the original conditions that caused the problem and then go from there.

Daniel, camera sounds great, especially for short line pix! :-)

[bcoakster]

Hey slmskrs, were you able to fix the issue you were having. I am having the same exact problem. I've replayed my relays and fcc filter, but still doing the same thing you described.
thanks

[wtrskrs]

Hey slmskrs, were you able to fix the issue you were having. I am having the same exact problem. I've replayed my relays and fcc filter, but still doing the same thing you described.
thanks

It ended up being the low pressure pump. I was getting flow but not the required amount. Install a new pump and no more problems. problem