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Re: What do you run your fuel pressure at?
[Re: Hemiruss]
#682963
04/28/10 08:52 PM
04/28/10 08:52 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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8.25 here,,no problem's, but I run a bypass system. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: What do you run your fuel pressure at?
[Re: 70satelliteguy]
#682964
04/28/10 08:53 PM
04/28/10 08:53 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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7 1/2 to 8 psi is about all the needle and seat can hold on a calibrated gauge... most people never check their gauge accuracy so they believe the number they see to be correct.... maybe it is, maybe it isnt... but from flowing fuel pumps for Chrysler for a few years thats the spec to shoot for 
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Re: What do you run your fuel pressure at?
[Re: Hemiruss]
#682965
04/28/10 08:56 PM
04/28/10 08:56 PM
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Joined: Aug 2009
Posts: 2,049
Mooresburg, Tn
'72CudaRacer
top fuel
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top fuel
Joined: Aug 2009
Posts: 2,049
Mooresburg, Tn
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7.5 lbs is not too much as long as your floats and needle & seats are good. Mine is set at 8 lbs 440 w/ 1050 dominator. I found out a long time ago that just because someone tells you something won't work, don't mean it's so. Might not work for them, until you try it for your self, you won't know if it will work for you or not. Lots of folks kept telling me a 4.56 gear was not enough gear to get my heavy car moving...  Brian Dunnigan
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Re: What do you run your fuel pressure at?
[Re: dennismopar73]
#682969
04/29/10 12:07 AM
04/29/10 12:07 AM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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As long as you have fuel pressure in the supply line, when you are riding it hard, you've got enough.  The fuel in the carb, isn't under any pressure when it's delivered to the engine(other than atmospheric) The fuel pump only keeps the bowls full. A steady 5 psi, is all you need. THAT said, more doesn't hurt, or gain you anything as long as the needle and seat can contain it. As long as the pressure stays up, you have enough fuel delivery for the carb. FWIW, I run 5 psi with a dead head style regulator. 1/2" supply line with a holley blue pump.
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Re: What do you run your fuel pressure at?
[Re: dave571]
#682970
04/29/10 12:16 AM
04/29/10 12:16 AM
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Joined: Mar 2003
Posts: 2,515
PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,515
PA
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6 psi deadhead Mallory Comp 250 pump and regulator.
1050 Dominator.
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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Re: What do you run your fuel pressure at?
[Re: rebel]
#682973
04/29/10 09:43 AM
04/29/10 09:43 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
guage says 9 & so does the logger but it drops to 7 on WOT. dead head reg with bypass on the pump.
And when was the last time you had the transducer
calibrated ... when I was working I had to cal the
transducers every time we put them on a car... a
transducer goes out more than a gauge.... the problem
I have now is I dont have access to the cal equipment
anymore so I have to take what I have.... the gauges
are real close but I cant say about my transducers
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Re: What do you run your fuel pressure at?
[Re: 540DUSTER]
#682976
04/29/10 04:13 PM
04/29/10 04:13 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
if you increace the pressure at the reg. you decrease the volummn of fuel that will flow thru it.The pressure before the regulator is the place you want high pressure.NObody seems to care what happens before the regulator in a dead head system. 
True... pressure is a by product of flow VS restriction
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Re: What do you run your fuel pressure at?
[Re: 540DUSTER]
#682977
04/29/10 05:18 PM
04/29/10 05:18 PM
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Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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Quote:
if you increace the pressure at the reg. you decrease the volummn of fuel that will flow thru it.The pressure before the regulator is the place you want high pressure.NObody seems to care what happens before the regulator in a dead head system.
I run 22# at the pump and 7.5# at the reg
Rickster
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