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    Frostee's Avatar
    Frostee Posts: 2, Reputation: 1
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    #1

    Dec 12, 2013, 06:38 AM
    91 international 4700 box truck
    I'm working on a 91 international 4700 box truck, starts and idles just fine but under driving load loses power and dies. Will start up after about 10 min. changed out fuel filter/ with no improvement. Any ideas??
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Dec 12, 2013, 07:09 AM
    Is that a diesel?
    Frostee's Avatar
    Frostee Posts: 2, Reputation: 1
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    #3

    Dec 12, 2013, 09:52 AM
    Yes, in line 6, 5.9 / 360cid
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Dec 12, 2013, 11:58 AM
    Sometimes, fuel pump clearances increase, when it warms up under load, and fuel pressure drops. Check the fuel pressure, after it dies--it may need a new fuel pump.
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