Fuel System - Pontiac Forum - Pontiac Discussion Forums

Fuel System

Old 04-23-2018, 10:31 PM
Registered User
Thread Starter
Join Date: Apr 2018
Posts: 1
Default Fuel System

Hello everyone, New Guy here.
I am also new to the Pontiac world. I purchased a 68 GTO about a year ago. The car had been sitting since 1999. The owner I purchased it from had never gotten around to getting the car road worthy. The engine wiring harness had been melted from what appeared to be grounding problem. My brother and I replaced the engine wiring harness with one from M&H. I ordered the harness for an electronic distributor and an internally regulated alternator. I changed all the fluids in the car and put some oil in each cylinder and rotated the engine by hand for about 15 full rotations. I disconnected the fuel pump from the tank and the fuel line from the carb. We sprayed some break cleaner in the fuel line from the carb to the fuel pump and let it sit over night. Next day we spun it over and got all the bad fuel and varnish out of the fuel pump. We then connected the fuel pump to a 5 gallon gas can with new gas. I spun the car over a to make sure the new fuel was coming out. I hooked up a clear inline fuel filter and plugged it into the new carb. She fired right up.

I say all that to ask this question. The fuel pump had 1 inlet and 1 outlet. However, the gas tank has a fuel return line. I check with the parts store and sure enough they listed 2 fuel pumps. One for an AC car and one for a non AC car (mine has AC). Can anyone tell me why the AC car has a return line and also would there be any problems not using the return line. The reason I ask is, it seems most new gas tanks don't come with filler necks, especially the ones with return lines.
Any help would be greatly appreciated .

Related Topics
Thread Starter
Last Post
Automotive For Sale
04-26-2008 07:27 PM
General Tech
10-28-2006 11:37 PM
Audio/Visual Electronics
10-06-2006 09:16 PM
General Tech
10-04-2006 09:17 PM
Speed Engineering
Member Group And Special Buys
08-11-2006 08:47 PM

Thread Tools
Search this Thread
Quick Reply: Fuel System

Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.