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Fuel tank collapsing

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I'm on my third lift pump and I noticed today that my tank is sucking in on itself. I switched back to an Oem style while my new Holley is being warrantied. This all started when I noticed that I could pull my PF gauge down to 0psi, swapped in another pump and same deal. Can I really be sucking that much fuel through 7x12s? Like enough to suck my tank in on itself?

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  • Me78569
    Me78569

    take the fuel cap off and see what happens.  Guessing your tank is not venting.

  • JAG1
    JAG1

    Tank vent is a one way flapper valve mounted near the fuel lines at the tank top. It faces the dirt flying up and is about 3/16'' orifice or plastic tube. It sometimes clogs up. Best to get a vented f

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take the fuel cap off and see what happens.  Guessing your tank is not venting.

    • Like 2
    • Staff

    Tank vent is a one way flapper valve mounted near the fuel lines at the tank top. It faces the dirt flying up and is about 3/16'' orifice or plastic tube. It sometimes clogs up. Best to get a vented fuel cap or make yours vented.

    • Like 1
    • 1 month later...

    Thanks for the good description of where the vent is, JAG. I'll clean up there and see what it does for me.

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    Welcome To Mopar1973Man.Com LLC

    We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.