Rerouting fuel lines from sender

gnvair

gnvair

Master Mechanic
Sep 1, 2018
411
63
Southern New Jersey near Philly
My 78 Malibu with a 305 has a 3/8 feed. All of the EFI turbo Buicks also had 3/8" feed lines.
From my own experience, the 5/16" feed lines will not be a restriction unless you are supercharged and well over 500 horsepower to the tires.
 
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Olds307guy

Not-quite-so-new-guy
Nov 2, 2019
15
3
My 78 Malibu with a 305 has a 3/8 feed. All of the EFI turbo Buicks also had 3/8" feed lines.
From my own experience, the 5/16" feed lines will not be a restriction unless you are supercharged and well over 500 horsepower to the tires.
Yes! Thank you. No no maybe 180 horsies on my ride which is why i figured it may be ok todo all this. Its my first car build and ive been in the buisness for about a year. I work at a local salvage yard processing and dismantling cars so when igot the job i bought the car been Building it up ever since. No one to really kick ideas with so im thankfull for all the replies. Now im doing aftermarket fuel gaugue and filling tank up tommorow to see if all this was worth it.
 
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pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
26,124
113
Kitchener, Ontario
One thing I did when I dropped the gas tank for the first time a long time ago I set up the connection point for the lines in front of the gas tank so if I have to drop the gas tank it is easier to disconnect the lines and then drop the gas tank and it's easier to install the tank and then connect the lines.
 
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Olds307guy

Not-quite-so-new-guy
Nov 2, 2019
15
3
One thing I did when I dropped the gas tank for the first time a long time ago I set up the connection point for the lines in front of the gas tank so if I have to drop the gas tank it is easier to disconnect the lines and then drop the gas tank and it's easier to install the tank and then connect the lines.
Thank you guys. I just did my gas gaugue and tommorow im filling her up. Ive done evrything i could think of to solve my crank but no start issues. I just got a racing panel switch im going try if i get my fuel flowing and still no start.
 
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Olds307guy

Not-quite-so-new-guy
Nov 2, 2019
15
3
you should hear the pump working, are you sure you haven't wired the pump backwards?
I got a mechanical fuel pump which i did the bottle test to see if it picks up fuel and it did. So i redid the sending unit, and replaced the fuel filters. I ran a wire to the positive side of the sending unit to the gauge left post, i ran ground in middle and 12v on right post. Power will come from a toggle switch on the panel.

I basicly need to put gas in it and see if it pick up fuel. If it does and it doesnt stay running, im going tryto bypass ignition switch. I literally just found out one of mu spark plugs was not pluged in lol
 
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Olds307guy

Not-quite-so-new-guy
Nov 2, 2019
15
3
what kind of pump do you have that requires two 12 volt connections?
No my gas gaugue sir has 3 post on the back when looking from back of gaugue the left post would be to sending unit(intank) the middle would be ground and the right post would be power.
The sending unit it self has one wire for 12v and one for ground.
My fuel pump is mechanical and has no wires.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
26,124
113
Kitchener, Ontario
I thought you had an electric pump. Are you using the old 5/16 vent line for your fuel line? If that line has a hole in it the pump will never draw fuel from the tank
 

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