Hello, Well My brother has an 85 cv that we converted to 2-barrel carb and we connected the fuel line off of a tee right to the carb. This is a trick that an old mechanic showed us. Basicly most of the fuel goes right back through the return line but it develops only enough pressure to unseat the float valve in the carb. I did not think this would work but it does. We have the high pressure pump in the tank connected right to the carb off of a tee going back to the tank. Has anyone heard of or tried this before? Think this will eventually damage something? Thanks.
 |
-
-
Welcome to GMN!
Sounds interesting. Don't think anyone has tried it before that I know of. If it is running fine, I don't see why it couldn't run like that for years. If it truely works, I think we'll see even more people converting from CFI.1990 Country Squire - under restoration
1988 Crown Vic LTD Wagon - daily beater
GMN Box Panther History
Box Panther Horsepower and Torque Ratings
Box Panther Production Numbers -
Makes sense to me. Especially to someone who wouldn't want to pull the tank out and have to rig up a pickup tube and all that other nonsense.Comment
-
What size is the line coming off the T going to the carb? do you have a presure gauge so know exactly what the carb is getting?
RIP Jason P Harril, we'll miss ya bro
'80 Town Coupé
'84 Towncar - Teh Cobra TC, 408w powered
'16 Ram 1500 CC Outdoorsman, Hemi/3.92/8sp 4x4Comment
-
Interesting principle...1983 Grand Marquis 2Dr Sedan "Mercules"
Tremec TKO conversion, hydraulic clutch, HURST equipped!
Comment
-
Both supply and return are 5/16ths I believe. No we have not hooked up a gauge seeing as how we don't have one but the car has about 2500 miles on it. I would think something would have broke by now if it was going to.Comment
-
The only problem would be of course if the return line were to clog or get pinched it would flood big time, but I don't see that happening.Comment
-
Ideal solution would be a return style regulator. Just install that in place of the Tee fitting, and you can adjust the pressure exactly how you need it. I've heard of using fuel filters with 2 outlets and a single inlet as the tee, and it worked. Probably not ideal but as long as the fuel pressure is where you need it to be, you're good to go.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
-
Have any pics?1984 Ford Crown Vic LTD, The Murphmobile (RIP)
1985 Ford Crown Vic LTD, The Murph Deuce (SOLD)
1978 Chevrolet Caprice Classic, The Crapiece (current project)Comment
-
I'd run a small dead head style regulator before the carb and set the psi with a gauge just to be sure.
2009 Ford F-350 6.4 powerstroke diesel. 1977 Ford F-150 built 300 six, 5 speed trans. 1976 MG MGB roadster, 359w, t5 5 speed. 1996 Kawasaki ninja ZX6R.
My rod is glowing, my bead is clean, my middle name is acetyleneComment
-
As long as you stay under 7 psi you'll be fine.Comment
-
only reason I'd say return style instead of dead head, you wouldn't have possible problems with the pressure being too low. I'd be concerned about how stable the pressure would be under full demand.Originally posted by Mercmarquis View Post86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
-
With a carb fuel pressure isn't too important when refering to wot, it uses fuel from the bowl and it would take a while to run the bowl dry and when the float drops it wouldn't be alot of resistance to top the bowl back off..
Am I right?
This would make converting alot simpler...2000 Grand Marquis LS
2000 F150 XLT 6 inches of lift.
1987 Bill Blass Mark VII - Sold
1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
Mercury Owners Group member
Save The Whales, Restore an Old Station Wagon!!Comment
-
you dont need a lot of pressure at wide open, but that bowl runs dry fast under heavy throttle. Mostly the important thing at wide open is fuel flow rate. It can be at nearly zero psi as long as its keeping the bowl full. Poor flow volume will give a balls to the wall feeling for a period of time, then all you'll get is loud backfiring through the carb when suddenly the bowl goes dry and the mixture leans way out. Very bad for the engine to be starved for fuel at wide open.Last edited by gadget73; 12-11-2007, 12:06 AM.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
-
Would running a slightly smaller outlet on the T to the return line help increase flow to the carb? It would be less restriction, but not anymore pressure.2000 Grand Marquis LS
2000 F150 XLT 6 inches of lift.
1987 Bill Blass Mark VII - Sold
1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
Mercury Owners Group member
Save The Whales, Restore an Old Station Wagon!!Comment
Comment