How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Charles Your Own Question
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3705
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
Type Your Boat Question Here...
Charles is online now
A new question is answered every 9 seconds

Yamaha HPDI 200 just coming off winter storage. started rough

Customer Question

Yamaha HPDI 200 just coming off winter storage. started rough and would not idle. I put it in gear and ran at 3500-5000 rpm for 3 or minutes. Now it idles very high at 1500-2000 rpm. Why?
Submitted: 2 years ago.
Category: Boat
Expert:  Charles replied 2 years ago.
Hello, my name is***** will be assisting you today. Would you please post the full model number of the engine?
Customer: replied 2 years ago.
Yamaha 2007 Z200TXR. HPDI.
Expert:  Charles replied 2 years ago.
Thanks.Your engine has 2 pulse pumps on it. If one or both are leaking fuel into the engine, that can cause a high idle. Can you remove the pumps from the side of the block, leave all hoses connected. then use the primer bulb to see if there is any fuel at all leaking from the hole on the back of the pump. If there is, replace both pumps/

Related Boat Questions