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post #1 of (permalink) Old 04-25-2004, 03:03 PM Thread Starter
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switching to carb....

well I'm going to be building an SBC to toss in my truck instead of teh 4.3L. i will go to a carbed set-up because i understand how it works and am more comfortable with it. the transmission is still an issue right now since i dont know what to do about my electronic one, but i might just throw i na turbo350 tranny. anyways, do you guys know what the fuel pressure is out of teh fuel pump on carbed engines. I"m hoping i can keep my electronic fuel pump and the pressure will be close, or close enough that ican use a pressure regulator.

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post #2 of (permalink) Old 04-25-2004, 03:33 PM
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Re: switching to carb....

I'm not sure, but I think I remember reading that a fuel injected truck has a much higher fuel preasure than a carbureted one. Also, about your tranny, don't swap an OD tranny out for a non-OD one. There's a company out there that makes standalone computers for controlling an electronic transmission that is behind a carbureted engine. Someone here I think was asking about swapping a 4L80-E in '78 or so SFA.
post #3 of (permalink) Old 04-25-2004, 03:38 PM
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Re: switching to carb....

Jet, GMPP, and a few others make the standalone tranny computers. But hey if you get rid of the EFI, no idea why you want to but if you do, can you donate it to me [img]images/graemlins/grin.gif[/img]

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post #4 of (permalink) Old 04-25-2004, 10:56 PM
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Re: switching to carb....

Use a regulator, the type where it bypasses the pressure and returns it to the tank.

Carburetors like 5-7psi. Much more than 8psi and it'll usually blow past the seat. Anything less than 3psi and you'll probably run out of fuel in a long WOT condition. Most people turn down their pressure to around 3psi when playing in the woods.

Your TBI prefers 13psi but will run just fine at 10psi. Get down to 8-9 psi and it will run funny.
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post #5 of (permalink) Old 04-26-2004, 12:36 AM Thread Starter
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Re: switching to carb....

thanks wrath...pressure regulator for me then
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