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Old 11-18-2004, 02:31   #1 (permalink)
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Fuel Pump Pressure

What would the minimum fuel pressure be under prolonged WOT? I have a standard mech pump and appears to be leaning out at full load.
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Old 11-18-2004, 03:17   #2 (permalink)
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Re: Fuel Pump Pressure

Quote:
Originally Posted by northiam
What would the minimum fuel pressure be under prolonged WOT? I have a standard mech pump and appears to be leaning out at full load.
NFI. But in another thread recently it was generally agreed that mechanical pumps can't keep up after 5000 rpm. Mine had leaned out to 14.4 A/F ratio by 6900.

Thats why an electric pump and 1/2" line with regulator are being installed tomorrow. Then its off to the dyno again shortly to crack that magical 250rwkw figure.
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Old 11-18-2004, 03:46   #3 (permalink)
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Re: Fuel Pump Pressure

My old mech which was brand new dropped @ 5800rpm. Then it'd start detonating. It was no fun @ all.

[edit] 4PSI absolute worst. If it drops below that? It's time for an electric pump.

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Old 11-18-2004, 04:03   #4 (permalink)
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Re: Fuel Pump Pressure

Agree with Brenden, a good pump should stay between 5-6.5 psi for a street car. The standard mechanical is only about 4psi at idle.
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Old 11-18-2004, 04:11   #5 (permalink)
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Re: Fuel Pump Pressure

gas is presurised at about 40psi lol
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Old 11-18-2004, 04:19   #6 (permalink)
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Re: Fuel Pump Pressure

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Originally Posted by p4r4l3l
gas is presurised at about 40psi lol
ROFL. Thats all good if you want to run a BBQ.

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Old 11-18-2004, 04:21   #7 (permalink)
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Re: Fuel Pump Pressure

Quote:
Originally Posted by p4r4l3l
gas is presurised at about 40psi lol
Gee you must be a mechanical genius or something.

And the relevance is?
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Old 11-18-2004, 05:14   #8 (permalink)
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Re: Fuel Pump Pressure

If I fit an elec pump and say 1/2 inch fuel line where would the 1/2 inch line attach to the tank as the tank outlet is only 5/16 inch on a XA tank?
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Old 11-18-2004, 05:47   #9 (permalink)
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Re: Fuel Pump Pressure

Quote:
Originally Posted by p4r4l3l
gas is presurised at about 40psi lol
Only in your lower bowl!

We're not talking fuel injection if you'd noticed.
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Old 11-18-2004, 06:03   #10 (permalink)
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Re: Fuel Pump Pressure

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Originally Posted by TruBlu351
Only in your lower bowl!

We're not talking fuel injection if you'd noticed.
I think the poor fella was imagining LPG. Pretty amusing hey?
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