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Old 02-27-2010, 11:52 AM   #1 (permalink)
Siroadrnr
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What fuel line size??

I'm installing a Racor filter before my LP, and I want to use steel braided line. I'm going to install it at the hard line junction just past the chassis down turn. What size is the stock fitting, so I can look up an adapter to AN fittings?
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Old 03-07-2010, 04:28 PM   #2 (permalink)
Siroadrnr
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I must have my cloaking device on.....No one knows what size the fuel lines are??
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1997 GMC K2500 Suburban "F" 124,000 miles, bought in 2000 with 31,000, remote FS PMD in bumper nostril, homemade sink, OPS mod, Racor 645 filter, late aluminum rims with 265 BFG's, mouldings and rack shaved, black with tan leather.

1985 Monte Carlo SS 97 LT1, T56, Ford Electric Currant Red 9" Ford, 18" C6 Vette wheels...

1970 Plymouth Roadrunner In Violet, air grabber, pistol grip, 451 stroker on the stand....

1985 Harley Wide Glide bobber, OD green, no chrome!! (alergic to it!!)
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Old 03-29-2010, 03:23 PM   #3 (permalink)
peyton
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mine are 3/8 od. i just bought an electric lift pump, delphi fd0031 and it looks to be 3/8 as well.

peyton
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Old 03-29-2010, 06:29 PM   #4 (permalink)
SmithvilleD
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Tank to lp to fuel mgr is 3/8". Return line is 5/16".
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Old 03-29-2010, 11:27 PM   #5 (permalink)
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Feed is 3/8"steel o.d.,return is 1/4"steel o.d. So that would be 3/8" i.d rubber and 1/4' i.d. rubber connected to the hard line. IIRC.
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Old 03-30-2010, 01:01 AM   #6 (permalink)
SmithvilleD
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I've replumbed the system & was confident I'd needed 5/16" return line & yet I'd also used some 1/4". So I just looked to figure out what's what.

The metal return line plumbing on the engine is 1/4" until all the injector returns & pump return are combined in the back, where the final/single return line nub goes to 5/16". Just put this in for correctness for anybody searching in the future. Return line diameters is pretty much academic if you're just plumbing in the Racor

If you're set on using AN/braided stainless hose, you'll probably need to cut the 3/8 (-06) steel tube out of the tank, and use a -06 compression fitting to get adapted to using the more common hose ends. As this is such a low pressure system, I just used Summit's generic push-lock hose. Probably most significant thing on this run from tank to Racor to LP, is avoiding any air entry as that part of the system can be below ambient air pressure.

On the trucks, there's a nice spot to mount a Racor to the left/front bed crossmember in front of the fuel fill tube - tucks up in there nicely, don't know what options the Burb provides.
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1995 K2500, 8600 GVWR, 6.5TD, NV4500, 3.73:1, 18:1, balanced, Fluidampr, DSG timing gears, '97 cooling upgrades, DMax fan - SD fan clutch, Kennedy TD-Max chip, 2100 psi/pop injectors, 4" exhaust, ceramic coated exh manifolds/turbine housing/crossover pipe, Autometer: pyrometer, boost, oil temp, oil press, fuel press, & water temp gauges, remote oil filter, B&M plate-style oil cooler w/ braided SS oil lines, 30 micron Racor pre-lift pump, GMTDScan Tech, Dipaco PMD on large Al heatsink mounted behind frnt licence bracket in bumper
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