• To ALL forum users - As of late I have been getting quite a few private messages with questions about build ups here on the forum, or tech questions about your personal project. While I appreciate the interest, sending me a private message about these topics distracts from, and undermines the purpose of having a forum here. During the day I wear many hats as a small business owner-operator and I work tirelessly to provide the absolute best service possible to you, our valued customer. When I created this forum I rounded up some of the best minds I knew so that any tech question you might have could be asked and answered by either myself or one of my highly experienced moderators, this way the next time this same question is asked the answer can be easily found and utilized by the next IH enthusiast having the same question. This allows me the freedom to run the day to day operations of the business and minimize the impact to shipments and shop activities that these distractions can cause. It is of the up most importance for me to complete the daily tasks in order to best take care of you our customer, all the while providing you a forum to get the level advice and input you have come to expect and deserve from the premier IH shop in the country.

    So with that I ask that anyone with a question about one of our build ups or a general tech question to please use the forum as it was intended. I am absolutely available by telephone to answer your questions as well but at times may direct you back to our website to better field your question or questions. Most other private messages I will be glad to answer for you.

    Thank you for your understanding.

    Jeff Ismail

Hfi fuel dumping out of throttle body


New member
Installed the HfI system and I thought I had everything set properly turns out there’s no fuel while the engine cranks over.

Trouble shooting in the manual wants me to check the voltage to the pink wire on the injector plug while key is on. So I disconnected the injector then turn the key to the on position. Fuel started dumping out on the back of the throttle body right behind the injectors. It almost looks like one of the injectors housing and I can see a spring in there.I’m assuming it’s a pressure release or something?

disconnected the battery and computer for a few minutes, reconnected them and reconnected the injector and there is still fuel dumping out of the same area?

anyone know what’s going on?


New member
I was able to get in touch with Bill.

What seemed to have happen was an old vented gas cap that no longer vented at the proper psi caused the tank/fuel system to build pressure and rupture the diaphragm in the throttle body. Replaced the diaphragm and gas cap and all seems well!