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boost dropped when i put new pump on

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Old Jan 2, 2012 | 09:53 AM
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From: Ft.Worth Tx.
Question boost dropped when i put new pump on
ok i rebuilt pump its stock now.boost is 15 when i punch it.before i rebuilt pump it was 25,but i did this to the pump then (Rotate fuel pin (cone) diaghram) is this why i dont push 25 anymore.thanks
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Old Jan 2, 2012 | 10:10 AM
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Have you made any changes to your fuel screw or timing? I have read that the timing bump will drop boost some.
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Old Jan 2, 2012 | 10:37 AM
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From: Ft.Worth Tx.
new pump still stock
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Old Jan 2, 2012 | 10:40 AM
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Was your old pump stock?
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Old Jan 2, 2012 | 11:43 AM
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With my pump cranked up I only hit 27psi max. I think your around stock psi now.
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Old Jan 2, 2012 | 08:53 PM
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From: Mo
Another thing to check is make sure the AFC line is'nt cracked.
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Old Jan 2, 2012 | 10:07 PM
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Your turbo is spun with exhaust pressure. Increasing the fuel increases exhaust witch spins the turbo better and increases boost. At least that's my understanding.
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Old Jan 3, 2012 | 12:16 AM
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From: Ft.Worth Tx.
no this all i did to my old pump.and where can i find the AFC line.and im pretty sure what wrong with it
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Old Jan 3, 2012 | 12:35 AM
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You put both washers back on when you hooked the AFC line up?
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Old Jan 3, 2012 | 07:58 AM
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From: Mo
If in fact your missing a washer from the AFC banjo, I'v found that a injector washer from a non I/C truck will work in a pinch.
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Old Jan 3, 2012 | 09:17 AM
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From: Ft.Worth Tx.
no there both on there.do y'all now how to adjust the idle
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Old Jan 3, 2012 | 12:31 PM
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Threaded screw on back of AFC is the idle. The one on the front is a throttle stop, commonly called the high idle adjustment.
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Old Jan 3, 2012 | 12:36 PM
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I'm not sure but if my understanding on how more fuel increases exhaust/drive pressure is correct then I can see how turning the fuel pin could increase boost some.
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Old Jan 3, 2012 | 08:21 PM
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From: Ft.Worth Tx.
well got to tear down my timing cover again .front seal leaking
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Old Jan 3, 2012 | 09:16 PM
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That stinks. Wonder if that's the cause of your problem.
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