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Fuel issue

NITERIDA

New Member
I have just bought a 1999 Speedster with the twin 787s. One engine starts and runs but the other doesn't seem to be getting any fuel. The clear fuel filter going to that engine is not filling up. Since both engines are fed from the same fuel pump I assume it is not a pump issue but then I am not sure what would cause one side not to flow if the other is. A blockage is the most likely answer but before I go and pull all the fuel lines I thought I would ask if there is anything else I should be looking at first ?
Thanks
 
what are you considering the fuel pump? each engine has its own fuel pump mounted to the carb. they do not share a pump.
Damn - I just assumed the big thing sticking out the tank was the pump !!
Will have to have a closer look or maybe read the manual :)
 
inside the tank is simply two straws, a shorter one to pick up the fuel when the tank is full and a longer straw when the fuel gets low (kinda like a reserve tank). and inside that baffle (what they call the straw assembly) is a small computer board that reads the fuel level and delivers the message to the dash.

the fuel pumps which are apart of the carbs, and accelerator pumps have many youtube videos on how to rebuild them if they are not working.
 
inside the tank is simply two straws, a shorter one to pick up the fuel when the tank is full and a longer straw when the fuel gets low (kinda like a reserve tank). and inside that baffle (what they call the straw assembly) is a small computer board that reads the fuel level and delivers the message to the dash.

the fuel pumps which are apart of the carbs, and accelerator pumps have many youtube videos on how to rebuild them if they are not working.
Mine seem to have a separate pump before the carbs. its a little black plastic box that looks like the accelerator pump on the carbs. I have just downloaded a service manual but they don't seem to show the same setup :(
Time to get the tools out and investigate. Is there an easy way to work on these in the boat ? Take the cover off completely or just jump in the engine bay ??
 
inside the tank is simply two straws, a shorter one to pick up the fuel when the tank is full and a longer straw when the fuel gets low (kinda like a reserve tank). and inside that baffle (what they call the straw assembly) is a small computer board that reads the fuel level and delivers the message to the dash.

the fuel pumps which are apart of the carbs, and accelerator pumps have many youtube videos on how to rebuild them if they are not working.
OK found the fuel pumps - they are separate from the carbs but the port side one is right under the oil tank and impossible to get to without taking the oil tank out first :(
 
Mine seem to have a separate pump before the carbs. its a little black plastic box that looks like the accelerator pump on the carbs. I have just downloaded a service manual but they don't seem to show the same setup :(
Time to get the tools out and investigate. Is there an easy way to work on these in the boat ? Take the cover off completely or just jump in the engine bay ??
Taking the back lid off makes life so much easier when working on these,
 
OK found the fuel pumps - they are separate from the carbs but the port side one is right under the oil tank and impossible to get to without taking the oil tank out first :(
I would be interested to see a picture of the separate fuel pumps, the only time I have ever heard of them was the yellow 587 ( I think ) is it still a diaphragm pump working off the pulse from the crankcase?
 
If you have the 787’s you need to read the carb write up that is sticky at top of this forum.


All the answers you could want and some you don’t know you need yet.

Working on the carbs in the boat is a nightmare of upsideness. Which everything in these boats is. Taking the rear Hatch off helps for a lot of tasks but not enough to do the carbs while in the boat.
 
If you have the 787’s you need to read the carb write up that is sticky at top of this forum.


All the answers you could want and some you don’t know you need yet.

Working on the carbs in the boat is a nightmare of upsideness. Which everything in these boats is. Taking the rear Hatch off helps for a lot of tasks but not enough to do the carbs while in the boat.
Thanks - I had already seen that and had a mini heart attack over it :(
 
Thanks - I had already seen that and had a mini heart attack over it :(
I often tell people If you are going to own a 20+ yo high performance 2 stroke anything you will need some mechanical skills and develops more. Wether that is a jet boat, jet ski, snowmobile or other it will require virtually constant upkeep. The nature of these performance engines running close to optimal all the time. That said it is very doable for those with desire and some skills and the ability to learn.

The huge bonus is sites like this and the fact that nearly all of the issues you will have are answered. I keep a 3-ring binder with all sort of specific notes about my 1997 Challenger 1800. Print out threads and highlight issues and solutions so when they come back the answer is there. Also when you solve something that you asked about here, PLEASE come back and post a follow up. It helps everyone.

Last weekend I did the set of carbs on the starboard engine in my boat. About 3.5 hours between grabbing first tools to pushing starter button to check if I did it right. Not my first time doing a set of 787 carbs. I’m guessing the first time it was close to twice as long. Just follow the steps that @mikidymac so kindly laid out.

If you don’t want to wrench on a boat then a mercruiser 3L maybe better suited. Here in the northeast there aren’t many/any marinas that will work on these 25 year old boats.
 
I often tell people If you are going to own a 20+ yo high performance 2 stroke anything you will need some mechanical skills and develops more. Wether that is a jet boat, jet ski, snowmobile or other it will require virtually constant upkeep. The nature of these performance engines running close to optimal all the time. That said it is very doable for those with desire and some skills and the ability to learn.

The huge bonus is sites like this and the fact that nearly all of the issues you will have are answered. I keep a 3-ring binder with all sort of specific notes about my 1997 Challenger 1800. Print out threads and highlight issues and solutions so when they come back the answer is there. Also when you solve something that you asked about here, PLEASE come back and post a follow up. It helps everyone.

Last weekend I did the set of carbs on the starboard engine in my boat. About 3.5 hours between grabbing first tools to pushing starter button to check if I did it right. Not my first time doing a set of 787 carbs. I’m guessing the first time it was close to twice as long. Just follow the steps that @mikidymac so kindly laid out.

If you don’t want to wrench on a boat then a mercruiser 3L maybe better suited. Here in the northeast there aren’t many/any marinas that will work on these 25 year old boats.
I am an experienced mechanic having raced and fettled 2 stroke GP bikes :)
I would just prefer not to have to do any work in my old age and certainly not looking forward to being a contortionist :(
 
I roadraced an RZ350 set up for the track in my younger times. That’s how I eventually got into ski-doos. 2 strokes are great fun.

The constant upside down of working on these boats is the worst part. When they work they are an absolute blast! But I’d rather be riding my snowmobile.
 
I roadraced an RZ350 set up for the track in my younger times. That’s how I eventually got into ski-doos. 2 strokes are great fun.

The constant upside down of working on these boats is the worst part. When they work they are an absolute blast! But I’d rather be riding my snowmobile.
I raced KR/KR1/TZ125 and have just bought 2 RGVs :)
Gotta have 2 strokes - never realised how much I missed them !!
 
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