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Offline pintovol

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Mechanical Fuel Pump ?s help
« on: January 08, 2012, 11:40:04 AM »
3 lines on this pump which one goes to fuel pickup on sender ...which one goes to top of tank and which one goes to the smaller nipple on the fuel sender

Offline pintovol

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Re: Mechanical Fuel Pump ?s help
« Reply #1 on: January 08, 2012, 11:42:34 AM »
here is pic

Offline pintovol

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Re: Mechanical Fuel Pump ?s help
« Reply #2 on: January 09, 2012, 10:00:12 AM »
No one knows?????

Offline Original74

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Re: Mechanical Fuel Pump ?s help
« Reply #3 on: January 09, 2012, 10:17:45 AM »
Airtex part #6748, available at AutoZone, Advance Auto and NAPA for $24.99.
 
What timing, just bought one of these and installed this past weekend!
 
Hope this helps,
Dave
Dave Herbeck- Missing from us... He will always be with us

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Offline pintovol

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Re: Mechanical Fuel Pump ?s help
« Reply #4 on: January 09, 2012, 10:36:25 AM »
Airtex part #6748, available at AutoZone, Advance Auto and NAPA for $24.99.
 
What timing, just bought one of these and installed this past weekend!
 
Hope this helps,
Dave

I want to know which one of the lines/  nipples on the fuel pump goes to the fuel pick up on the sender and which one goes to the top of the gas tank and which one goes to the smaller line on fuel sender

Offline Original74

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Re: Mechanical Fuel Pump ?s help
« Reply #5 on: January 09, 2012, 10:56:51 AM »
Based on your picture above, the largest line, the supply line from the gas tank hooks up on the left. The threaded line to the right goes up to the carb, and the nipple just above that threaded connection is the return line to the gas tank. The return line is the smaller of the two rubber hoses that connect to the metal lines tied to the frame. Does that make sense?
 
Dave
Dave Herbeck- Missing from us... He will always be with us

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1976 Runabout, project.
1979 Sedan, 'Jade', 429 miles, show car, really needs to be in a museum. I am building him one!
1979 Runabout, light blue, 39,000 miles, daily driver

Offline Original74

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Re: Mechanical Fuel Pump ?s help
« Reply #6 on: January 09, 2012, 11:08:43 AM »
Pintovol,
 
I am so sorry, I mis-read the title to this post being Fuel Pump #'s, as in numbers. Thus my reference to part numbers. My bad. Just for safety's sake, I installed a good size metal fuel filter just before hooking into the bottom of the fuel pump, that way I filter out more garbage from a 35 year old tank and lines, not passing it through the fuel pump. On my daily driver, I installed a small electric fuel pump at the rear by the tank and absolutely love it. No grinding to prime the fuel system between sitting, just fires right up. I think this is one of the easiest fixes, and most overlooked for our cars that might sit a few weeks between starts. Of course, all safety precautions are in order when doing this, but I love it.
 
Dave
Dave Herbeck- Missing from us... He will always be with us

1974 Sedan, 'Geraldine', 45,000 miles, orange and white, show car.
1976 Runabout, project.
1979 Sedan, 'Jade', 429 miles, show car, really needs to be in a museum. I am building him one!
1979 Runabout, light blue, 39,000 miles, daily driver

Offline pintovol

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Re: Mechanical Fuel Pump ?s help
« Reply #7 on: January 09, 2012, 11:14:43 AM »
Pintovol,
 
I am so sorry, I mis-read the title to this post being Fuel Pump #'s, as in numbers. Thus my reference to part numbers. My bad. Just for safety's sake, I installed a good size metal fuel filter just before hooking into the bottom of the fuel pump, that way I filter out more garbage from a 35 year old tank and lines, not passing it through the fuel pump. On my daily driver, I installed a small electric fuel pump at the rear by the tank and absolutely love it. No grinding to prime the fuel system between sitting, just fires right up. I think this is one of the easiest fixes, and most overlooked for our cars that might sit a few weeks between starts. Of course, all safety precautions are in order when doing this, but I love it.
 
Dave

yes,,,

but my gas tank has a line on top of it where does it go? not to the fuel pump?

Offline Original74

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Re: Mechanical Fuel Pump ?s help
« Reply #8 on: January 09, 2012, 11:26:21 AM »
Well, so now you are at the rear of the car and not talking about fuel line connections at the fuel pump, correct? Only reason I ask that, is to clarify.
 
At the rear, where the sending unit connects, there are two metal lines that have rubber hose connections to the two fuel lines that run to the front. These are the supply and return lines that end at the front and then connect via rubber hose to the fuel pump as previously described. As to a vent line, you have me there. I know the charcoal canister turns fuel vapors back to liquid gasoline and has to somehow get that gasoline back to the tank. I do not recall a third metal fuel line, but I also don't recall what the hose on the vent connects to. I apologize, but I will have to look this evening and see where that line connects. My gut feel is a third line to the canister, but I stand to be corrected until I can confirm.
 
Dave
Dave Herbeck- Missing from us... He will always be with us

1974 Sedan, 'Geraldine', 45,000 miles, orange and white, show car.
1976 Runabout, project.
1979 Sedan, 'Jade', 429 miles, show car, really needs to be in a museum. I am building him one!
1979 Runabout, light blue, 39,000 miles, daily driver

Offline pintovol

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Re: Mechanical Fuel Pump ?s help
« Reply #9 on: January 09, 2012, 11:33:21 AM »
Well, so now you are at the rear of the car and not talking about fuel line connections at the fuel pump, correct? Only reason I ask that, is to clarify.
 
At the rear, where the sending unit connects, there are two metal lines that have rubber hose connections to the two fuel lines that run to the front. These are the supply and return lines that end at the front and then connect via rubber hose to the fuel pump as previously described. As to a vent line, you have me there. I know the charcoal canister turns fuel vapors back to liquid gasoline and has to somehow get that gasoline back to the tank. I do not recall a third metal fuel line, but I also don't recall what the hose on the vent connects to. I apologize, but I will have to look this evening and see where that line connects. My gut feel is a third line to the canister, but I stand to be corrected until I can confirm.
 
Dave

the 3rd line is a small line on the very top of the tank

can i just plug off that line?

Offline dave1987

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Re: Mechanical Fuel Pump ?s help
« Reply #10 on: January 09, 2012, 02:53:42 PM »
You can stick a breather at the end of the line so pressure doesn't build up in the tank
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