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Adj. Fuel Pressure Regulator on 91

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Old 04-20-2009, 10:04 AM
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rickso84
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Default Adj. Fuel Pressure Regulator on 91
Is the fuel pressure regulator on a '91 L98 adjustable? Noticed there's a hex screw on the top of the regulator... pressure adjust?
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Old 04-20-2009, 10:51 AM
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BADDUCK
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No, not from the factory
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Old 04-20-2009, 03:57 PM
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ch@0s
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If it has a bolt going in the top of it its prob an aftermarket AFPR
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Old 04-21-2009, 08:20 AM
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rickso84
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It's not so much a bolt as a recessed hex-head screw.
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Old 04-21-2009, 10:00 AM
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Originally Posted by ch@0s
If it has a bolt going in the top of it its prob an aftermarket AFPR

The stock top is plain metal , so if it has any type of screw/ bolt there it should be adjustable.
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Old 04-21-2009, 11:05 AM
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There SHOULD be a bolt in the hole but evidently it fell out along the way. THe dead head pressure was 28lb... way to low. Installing a bolt and locking nut allowed adjustment back into spec range. This should solve my mileage issues likely being caused by poor atomization due to low fuel pressure.
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Old 05-14-2009, 02:18 PM
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tshirttom
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Default fuel pressure
It should be around 45 instead?
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Old 05-14-2009, 02:39 PM
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Originally Posted by rodj
The stock top is plain metal , so if it has any type of screw/ bolt there it should be adjustable.
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