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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 11-16-2012   #1 (permalink)
martjr is offline Rookie


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Default 1963/1964 Fuel Pump PSI and Fuel Line Size

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I have a 1963-1965 289 HiPo motor with a Autolite 4100 600cfm carb fit into a 1966 Sunbeam Tiger. Estimated HP 271-306.

The stock 260/289 fuel lines were 5/16" and ran a SU AUF301/303 points fuel pump moving 15GPH at 2 psi max but only supported around 200hp.

I need to know how much fuel pressure and GPH I should need.

I am planning to increase fuel line size to 3/8" and would like to secure a SU Electronic pump to maintain the original look.

Thanks in advance.
Joel Martin
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Unread 11-16-2012   #2 (permalink)
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The normal SU pumps only have 1.5-2 psi output and I wouldn't consider one for a 289. I didn't realize the Tiger used an SU. The pressure pulsation isn't so much a problem as the generally low pressure. The US factory fuel pump was 4-6 psi and the minimum output was 22.5 GPH. Ford used that spec for HiPo 289, 390, etc.

Some of the later SU's were 'high pressure' which meant 3 psi. If you need the look, one of the HP SU's would be better than what you have.

Is the SU in the engine compartment? If so, and you can hide a small 5-6 psi electric pump at the rear, you can run the rear higher pressure pump output through the SU lines and the SU will just shut off and do nothing. (I've done it, its a long story.) That would solve your delivery problem and still maintain an SU look under the bonnet. With the right switching you can maintain the SU click-click for show and when no one is looking turn on the REAL pump at the rear. (I works, I took home a trophy. )
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Unread 11-16-2012   #3 (permalink)
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That 22.5 GPH is at an engine idle speed of 500 RPM. As a mechanical pump the output would go up as RPMs increase but its probably not a linear increase.
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Unread 11-16-2012   #4 (permalink)
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Quote:
increase fuel line size to 3/8"
Ford GT has 5/16"...nuff said...

Just get a good FP for your 289 from Summit or Jegs....easily support your HP goal.
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