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Old 05-17-2013, 06:33 PM   #1
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92 firebird 3.1 no vacuum?

I got a 1992 firebird with a 3.1 that now has no vacum pressure after replacing the fuel pressure regulator. All hoses hooked up and replaced all the lines I can get to any suggestions.
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Old 05-17-2013, 07:17 PM   #2
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What's not working that makes you think there's no vacuum?
Does the engine start?
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Old 05-17-2013, 07:31 PM   #3
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What's not working that makes you think there's no vacuum?
Does the engine start?
I unhook any line after trying to start and have no vacum how would I tell or find a leak?
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Old 05-17-2013, 07:31 PM   #4
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What's not working that makes you think there's no vacuum?
Does the engine start?
No at at all
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Old 05-17-2013, 07:38 PM   #5
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Originally Posted by ryan_aldrich View Post
I got a 1992 firebird with a 3.1 that now has no vacum pressure after replacing the fuel pressure regulator. All hoses hooked up and replaced all the lines I can get to any suggestions.
try spraying carb cleaner on the vac fittings and gaskets if the idle changes theresa leak.im guessing theres a big vac leak somewhere.
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Old 05-17-2013, 07:43 PM   #6
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I have no idle if it won't start lol
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Old 05-17-2013, 07:50 PM   #7
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Also because of this my fuel pressure regulator is not allowing fuel into the throttle body. Before I changed the FPR I had fuel going into the vacum line which went to the air pump
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Old 05-17-2013, 07:57 PM   #8
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1. You don't need vacuum for the fuel pressure regulator to let fuel flow, and actually the regulator allows more fuel under no vacuum ( at WOT for instance ) than it does with vacuum applied.
2. There is no vacuum with the engine off.
3. Your problem is not lack of vacuum, it is an incorrectly installed regulator, a clogged fuel filter or a bad fuel pump.
4. If the engine started before you changed the regulator, something is not hooked up correctly.
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Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 189k miles

Last edited by NavyVet; 05-17-2013 at 10:09 PM.
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Old 05-17-2013, 08:00 PM   #9
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No it wouldn't start before replacing I just had a bad regulator. How do you install it wrong there's only one way. Fuel pump, filter and fuse are all new and relay is new too.
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Old 05-17-2013, 08:27 PM   #10
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Does the pump prime before you try to start it? Was the fuse blown that you replaced it?
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Old 05-17-2013, 09:14 PM   #11
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Yeah it primes and no it wasn't blown
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Old 05-17-2013, 09:26 PM   #12
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Yeah it primes and no it wasn't blown
does the starter turn?
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Old 05-17-2013, 09:51 PM   #13
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Quote:
Originally Posted by ryan_aldrich View Post
Yeah it primes and no it wasn't blown
Ok what's your fuel pressure, are you getting spark, and why replace a fuse or relay that isn't bad?
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Old 05-17-2013, 10:10 PM   #14
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Quote:
Originally Posted by ryan_aldrich View Post
No it wouldn't start before replacing I just had a bad regulator. How do you install it wrong there's only one way. Fuel pump, filter and fuse are all new and relay is new too.
What made you think the regulator was bad because it wouldn't start.
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Original owner, 192k miles and counting.
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Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 189k miles
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Old 05-18-2013, 03:20 AM   #15
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Starter turns and replaced FPR because no fuel pressure and all other components are new.
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