No Fuel at TBI

[BLovell]

I have a 97 SNOB with the 5.7 GM TBI, and for some time now I have had problems with the engine dying or not starting b/c of the lack of fuel. When I turn the key I can hear both pumps turning on but no fuel. Yesterday I disconnected the fuel line at the TBI turned the key on, heard the pumps turn on and yet no fuel comes out of the fuel line. So I then disconnected the fuel return line from the TBI, turned the key on and fuel started spitting off and on out of it. So I hooked the return line back to the TBI turned the key and now fuel starts flowing out of the fuel line. So now I am completly lost on what is going on here, so if there are any ideas please let me hear them. Thanks

[jon4pres]

RE: No Fuel at TBI

i have a newbie question what does SNOB stand for? Ski Nautique ____ ________

[BLovell]

RE: No Fuel at TBI

SKi Nautique Open Bow

[surroundsound64]

I may be a little confused as to exactly what is going on... but if you're only getting a little trickle out of the fuel line, check that filter. That fuel should be SPRAYING out of there with a decent amount of psi behind it. If it is the filter, change it before it kills the pump.

[BLovell]

No the filter is new, I thought of it and changed it, apparently with no luck.

[braibert]

Something almost exactly the same happened on my 97 ski nautique with a GT-40. The fuel canister has a small rubber hose in it. Mine was slightly too long(this is a know problem, corrected I believe for 98), so the hose had a slight "bend" or "fold" in it. This caused a pin hole in the hose.

With the pin hole in the hose, the fuel line the TBI in your case loses pressure and you will not get any fuel spray. You can get a hose replacement from Correct Craft, I am sure it is less than $10.

Bob

[25xs]

Did you have the problem before you changed the filter??? With an electric fuel pump, you really should fill the new filter to the rim with clean gas before you install it to help prime the system as well as purge it from any entrapped air which will mimmick vapor lock.

Step 2. NO SPARKS ALLOWED!!! Remove the electric fuel pump from the boat. Fill the inlet end with carburetor cleaner and allow it to soak for more than one hour. Hook 12V wires to the pigtail and energize the pump briefly from "upwind" or far enough away to not ignite the gas/carb cleaner fumes. I use alligator clips on the pigtail and touch them to a jetski battery about 4ft away. A similar version of this 'cleaning' is recommended in a MerCruiser service bulletin to free up a stuck or dirty fuel pump.

[BLovell]

Well it still is happening. On Friday I decided to winterize the SNOB, so I turned the key on heard the pumps come on cranked it (with the spark arrestor off) saw there was no fuel coming out of the TBI injectors and therefore it would not start. I disconnected the FCC (high press. )pump so I could hear the low press. pump working, and I did hear it. So I then reconnected it and disconnected the low press. pump to hear the FCC(high press.) pump, it also worked and I also got fuel coming out of the TBI. So I ran the engine to change the oil. After I changed the oil it was time to restart it to put in the winterizing fluid and fog the motor. But again I had no fuel coming out of the TBI, I then disconnected the low press. pump and then I got fuel out of the TBI and the engine started with the low pump still disconnected. Man, am I completley lost now or what. Why am I not getting fuel at the TBI and then sometimes I do. That is the million dollar question. Any help or suggestions to try?

[BLovell]

I THINK (I sure hope so) I found the problem. I checked the voltage to the low press. pump and checked press. from the low press. pump and it was good. I then checked the voltage to the FCC and it was good, I then checked to see if the FCC pump would work with power from the batt. and it worked great. I then reconnected it turned it on and nothing. So I checked the connection and that is what it was( I hope). The female end from the power supply was spread very far apart and was appparently making an intermittent connection which led to my intermmitent problem. So I will update the situation again after I recheck it in a couple of days to verify it is still working.