2004 Yamaha F115TLRD

BKane

Recruit
Joined
May 15, 2017
Messages
5
hello... got an issue I'm hoping you guys can help with. Got 04 Yamaha F115 TLRD made in 11 of 04 which I only mention because from what I understand from Yamaha some parts are 05 being it's made so late in 04. Anyway have been chasing my tale with this thing. Runs great for 30-60 sec then just falls on its face.. Boggs down then if you give it a sec it will run another 30-60sec or so , but if someone sits and pumps the bulb it will stay on plain. Have tried running with external tank same thing. Changed the fuel pump does run better but it was original pump so it should. Also no change as far as it bogging after 30-60sec of wot... vst tank has been done... injectors cleaned myself .. seems to shoot in a nice full cone.... don't use ethanol as far I know. Run rec 90 seems to run amazing for sometimes a couple mins plain right off. Then bog then stall in idle as well?? Please if there is any other info I can add to help... this is just.. above my pay grade. If someone has any ideas they will be greatly appreciated. Thnx
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,212
monitoring fuel pressures will help find the problem.
if both the lift pump pressure and rail pressure is dropping then there is a restriction or air leak before the lift pump.
If just Rail is dropping then it has to be between the 2
 

charleso

Petty Officer 2nd Class
Joined
Nov 13, 2006
Messages
179
I am going with 99yam40 on this one. You are losing fuel pressure somewhere. Going to have to do some research on what correct pressure should be and test to determine why the motor is losing it. Could be an electrical issue dropping the pump out or a leak bleeding pressure.
 

BKane

Recruit
Joined
May 15, 2017
Messages
5
Everything checks out fuel wise. Something is telling her to stop giving fuel @ wot.... she jumps out the hole... she screams for a min.... 🤔 Is there something I'm missing? Is there an electrical component that could cause this issue??
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,212
what are the fuel pressures when idling and then when WOT when the problem shows up?
 
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