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Thread: Fuel Pressure Drop

  1. #1

    Default Fuel Pressure Drop

    I have a dual quad Terminator Stealth system being fed by a Holley 340 log in tank pump though -10AN PTFE line and a 10 micron post filter (PN 162-570). Return is from a 12-845 regulator through -8AN back to the tank.The tank is vented.

    Here's the scenario: I set the pressure to 43 psi while the car is running and keep an eye on it through the handheld that is being fed fuel pressure info through a sensor placed on the fuel feed log on one throttle body. Pressure is fine for about 20-30 minutes, but then fall. When the pressure reaches about 32 psi, I adjust it up again to 45 psi and pressure immediatly begins to fall; about another 10 psi over about 20 minutes of running time. Do you think the pump is failing? Are there any other potential causes?

  2. #2
    Join Date
    Feb 2018
    Location
    Oregon
    Posts
    27

    Default

    Take a look at this thread: https://forums.holley.com/showthread...-Pressure-Drop. I was having somewhat similar issues and have since resolved the issue. Also, I'm assuming you're using the the higher pressure version of that regulator or have changed the spring. Having changed a few components in stages and observing the results, I personally think that not using the Holley dead-end style fuel supply and plumping it similar to a fuel rail installation is the way to go. Although there are obviously many users running the out of the box fuel supply with no issues.

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