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  1. #21

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    Here’s a good video showing how to test popoff pressure...
    https://www.google.com/search?client...essure&sbfbu=0

  2. #22
    http://greenhulk.net/forums/showthre...hlight=Pop-off
    read this thread. it says that it is impossible to measure pop off with an installed fuel pump

    Quote Originally Posted by Jonesyfxr View Post
    Here’s a good video showing how to test popoff pressure...
    https://www.google.com/search?client...essure&sbfbu=0


  3. #23

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    I know that thread well... this is what I followed:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #24
    That's why I asked this question. can the pressure differ when checking with the assembled pump? I've always checked everything assembled and ended up running out of fuel. is it possible that I have stretched the diaphragm of the fuel pump?

  5. #25

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    I broke my gauge and am waiting for a new one. When I get it, I’ll post the differences since the carbs are out now anyway.

  6. #26
    Adam's Avatar
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    It’s either a blocked fuel tap , blocked fuel filter , or the filters under the needle and seats being blocked . Fuel pressure dropping at full throttle means the engine is using the excess fuel that normally returns to the tank and is measured by the fuel pressure gauge . It’s a good idea to clean all the filters and fuel tap with compressed air till you get full pressure restored at full throttle. It’s possible to run lean if it’s allowed to go unchecked or the performance will drop .

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  8. #27
    Quote Originally Posted by Adam View Post
    It’s either a blocked fuel tap , blocked fuel filter , or the filters under the needle and seats being blocked . Fuel pressure dropping at full throttle means the engine is using the excess fuel that normally returns to the tank and is measured by the fuel pressure gauge . It’s a good idea to clean all the filters and fuel tap with compressed air till you get full pressure restored at full throttle. It’s possible to run lean if it’s allowed to go unchecked or the performance will drop .
    thanks for the answer. the only thing I didn't check was the fuel cock. next season I will plug the hoses bypassing it.

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