BlackWorksInc

I've come accross a small stumbling block in rebuilding my car, the fuel lines don't seem to be matching up well.

The '84 GSL-SE frame I am using has a GSL-SE fuel pump going to it. My first issue is that the larger of the three lines coming off the gas tank is a size larger than 3/8" as I can't get a 3/8" EFI Line to fit over the nipple. The second issue is that the second largest line from the tank, (1/4" I believe) is larger than than the 1/8" hard line running along the car.

Anyone know the proper sizes of the hardlines and tubing for the fuel system?
The routing I can see from the FSM but I am not seeing anything on their indiviudal tube diameters. Any help would be greatly appreciated.

j9fd3s

iTrader: (3)

its kind of german style, so the line from the tank to the pump is 10mm? maybe 12? then from the pump to the engine its 8mm (5/16), return is also 8mm. vent might be 6mm?

BlackWorksInc

Hmm.. Anyone know who sells metric lines?

j9fd3s

iTrader: (3)

5/16 = 8mm...

if you still want real metric stuff, bmw/mercedes usually stock 1m lengths, it goes bad on those cars

mazda stuff lasts forever, but its about $300 a foot

Jeff20B

iTrader: (13)

I went with 1/2" rubber line from tank to Carter 110 GPH pump. The pump came with 1/2" fittings so it all worked out in the end. Then after the pump I had to adapt it down to the car's size of 5/16" or 8mm.

BlackWorksInc

Okay so I was right about my suspicions of the main feed line being larger than 3/8"

BTW how did you adapt down the lines?

Jeff20B

iTrader: (13)

Brass fittings.

BlackWorksInc

They make step down fittings? I couldn't find any at my local autoparts store so I didn't know if they were common place.

OneRotor

iTrader: (3)

ACE Hardware or something similar. NOT Lowe's or Home Depot.

mpk490p

Jeff did you modify the tank pick up and return hard line or just the rubbers?

Jeff20B

iTrader: (13)

I used a GSL-SE tank which has a 1/2" send line. The pump is 1/2" in and out. On the output side I used some brass fittings to go from a 1/2" barb to a 5/16" barb so it would work with the car's stock fuel line. So, no I didn't modify any rubbers.