Fuel system for 383

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Fuel system for 383

Postby Johns10 » Wed Aug 09, 2017 9:32 am

Going to be doing my fuel system here in the next week and have a few questions. I'm building a 383 estimated to be around 450 hp. Read several topics on using the stock pump. I had a 2.8 in a 91. Does the stock pump have enough flow for 450 hp. If not I'm looking at getting a carter pump I've read on another topic. What are you guys doing for a pick up on external pumps. On the pump I'm looking at it has 3/8 input and output. Would i need to run 3/8 or 1/2 steel lines and 6an or 8an hose/fittings.
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Re: Fuel system for 383

Postby bgblock427 » Wed Aug 09, 2017 11:11 am

How did you come up with the HP number? what carb you running. Most times a 3/8 is plenty.
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Re: Fuel system for 383

Postby Johns10 » Wed Aug 09, 2017 11:30 am

The guy building it has built similar setups and that's what other people have gotten.
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Re: Fuel system for 383

Postby lowblazin94 » Wed Aug 09, 2017 1:15 pm

Stock pump for a 2.8 v6 might not be able to keep up.

Rick has an in tank pump he recommends and run a by-pass regulator.
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Re: Fuel system for 383

Postby XXXXXXXX » Thu Aug 10, 2017 2:18 am

I am running a 20 year old holley red pump.. it keeps 5lbs of pressure even under 7lbs of boost at wot. With that said.... if you go external I would recommend at least a holley blue pump if the engine is really going to make 450 hp.. however that may be a generous hp number by the builder depending on whats been done to the engine combo wise... I ran a 10.25 to 1 350 with 210 afr heads ... a real solid roller (not hydro roller) 580 lift 260/270@.050 etc with 2 holley 600hp carbs on a tunnel ram... 4200lb car ran mid 11's.. on the engine dyno before in car tuning it put out 528hp peak... so a 450hp 383 is going to need a solid fuel supply.. the in tank pump ric recommends should handle way more than a holley blue even.

Take a look at my sig.. you will see my blown 305 made 194 rwhp on the chassis dyno... I hope your 383 is 450hp if that's what you want but engine hp number tend to get a little inflated sometimes.. any way rics in tank pump or a holley blue should handle any of your needs.


PS you may want to check out lowblazns combo here viewtopic.php?f=28&t=35137&start=100 and see what type of power he is making and compare that you combo
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Re: Fuel system for 383

Postby Rickracer » Thu Aug 10, 2017 10:44 am

If you want simple and reliable, go with a factory replacement for a TBI 4.3 in Carter, Delphi, AC Delco, or a real Walbro, (not knockoff), and use a bypass style regulator. Personally, I've been using a Holley 12-803BP regulator for about 5 year now with ZERO problems. 8)
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