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Old 01-24-2010, 03:41 AM
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Fuel return line (carbed) - where?

I know I don't need a return line on a simple carbed SBC and a Holley Red pump, but I hate an electric full pump deadheading against a closed needle and seat in traffic - plus it looks "racy".

So - without buying a new regulator with a return port, I'm going to run a line from the Holley regulator (close to the carb) back into the tank. I will have a restrictor in that 4-AN line (actually a Holley carb jet) to create some back pressure.

Should I tap my return line in to the main fuel line before, or after the regulator? My gauge at the engine is after the regulator, so either way I can set my fuel pressure against the orifice that the carb sees.

Just bought lots of nice Earl's red and blue fittings and some braided line at Summit tonight (Valhalla!) - jewelry for the car!

Opinions? It'e easy to change, but I'd like to get it rigt the first time.

Just by the way - this is a Mid-Engineering Kelmark, SBC and turned-around Corvair transaxle.

My old fuel system was on the passenger side, but new Schoenfeld 180 headers and exhaust dump on that side, so I'm moving the fuel system over to the driver's side (reworking my fuel tank as well), and adding an isolator so I can run a second (safe) fuel pressure gauge in my dash.

Thanks -

Forrest - first post

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Old 01-24-2010, 03:46 AM
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The old way it was -

First pic right after I modified the frame for the headers and exhaust - now they are Jet-Hot coated.

Forrest
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Old 01-24-2010, 04:36 AM
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I would put the bleed after the regulator. Before the regulator it would be on the high pressure side and and will bleed more fuel than it will on the low pressure side.

Neat car Do you have a rear body section for it also??

Never paid much attention to the Kelmark, arent they usually VW Flat 4 powered, or am I just thinking of the Bradley GT??
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Old 01-24-2010, 06:06 AM
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Mid-Engineering, in Okemos, MI, made tube frames and three different GM drivetrains in the '70's and early '80s. Transverse Citation V6 moved to the rear, SBC and 'vair transaxle, and BBC/BBO and the Eldo/Toro THM425 transaxle moved to the rear.

I got a nice one from the original ('78) builder with just 6000 miles a couple years ago.

I've made LOTS of mods; trying to capture the late '60s big-bore sports-racing feel (Lola, McLaren, GT-40, like that).

Forrest
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Old 01-24-2010, 07:11 AM
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SWEET RIDE!!!!!
I'd drill and tap the fitting in one side of the regulator for a Holley carb jet (depending on what type fitting is in there, you may need to reduce it first with some type of brass fitting first), then attach your return line to that side of the regulator, and the carb to the other, this will allow you to simply change a jet to calibrate return fuel flow, and/or pressure range. AFAIK, the smallest Holley main jet is a #40, which is P/N 122-40, and will have a 1/4"/32 thread. If that's still to big, you can solder the hole shut and redrill it smaller, of course you could do the same with a larger jet, if you happen to already have some. I think with the typical fuel pressure range you'll be using, you will want somewhere between a .030" and .040" ofifice.
Or, you could replace the regulator with a Holley 12-803BP, which is already a bypass style regulator. The BP lines are oriented differently though, so if you already have the lines laid out the way you want them for the 12-803, you will have to change them to use the 12-803BP, on it, the inlet and outlets are on the sides, and return is on the bottom. Hope this helps, or gives ya some food for thought,

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Old 01-24-2010, 09:13 AM
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I have an electric intank pump in my 59 Elky.

Given that I live in a hot portion of the globe, my bypass regulator is keeping cooler fuel up near the carb at all times. (don't want no vapor locking---been thru that before on another car in Phoenix)

from the tank to a "T" at the base of the carb >>>>>to the bypass regulator under the car near the tank>>>>>>back to the tank

3/8" coming to the carb----5/16" to the regulator and tank
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