Question on mechanics fuel pump and fuel lines
March 21st, 2018, 06:10 AM
#1
Joe Ralph
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Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
Question on mechanical fuel pump and fuel lines
Hello all,
I have a 72 cutlass convertible A body with a 68 455 in it - I have had bad luck with electric pumps and want to put a mechanical pump in it. The parts store wanted to sell me a three hose adapter pump - after a little reading it seems that there is an fuel inlet and outlet + a return fuel line for the pump? My car has two steel lines running down the frame - I assume one is the primary fuel line - but I believe the other is the carbon canister vapor line? So no fuel return line? If I only need a two line pump how do I determine what pump will fit / work? - also ... when Installing the pump - it currently has just a metal plate covering the hole for the fuel pump - when I pull that will oil pour out? (Newbie question I know...) so the seal on pump will prevent oil leaking? Any help / insight is appreciated - thanks in advance for all reply’s!
Joe
I have a 72 cutlass convertible A body with a 68 455 in it - I have had bad luck with electric pumps and want to put a mechanical pump in it. The parts store wanted to sell me a three hose adapter pump - after a little reading it seems that there is an fuel inlet and outlet + a return fuel line for the pump? My car has two steel lines running down the frame - I assume one is the primary fuel line - but I believe the other is the carbon canister vapor line? So no fuel return line? If I only need a two line pump how do I determine what pump will fit / work? - also ... when Installing the pump - it currently has just a metal plate covering the hole for the fuel pump - when I pull that will oil pour out? (Newbie question I know...) so the seal on pump will prevent oil leaking? Any help / insight is appreciated - thanks in advance for all reply’s!
Joe
Last edited by 72442455; March 21st, 2018 at 06:18 AM. Reason: Typo
March 21st, 2018, 08:32 AM
#2
Registered User
Join Date: Feb 2010
Location: Modesto CA
Posts: 1,528
The second steel line in your frame is the return line. The vapor canister comes off the tank. The third line on the fuel pump would go to your carb. And no oil should come out of the fuel pump block off plate when removed unless the motor was running.
March 21st, 2018, 09:44 AM
#3
Joe Ralph
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Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
Joe
March 21st, 2018, 12:53 PM
#6
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,301
Sorry, this is not correct. For a 1972 Cutlass, the 3/8 line is the feed line to the pump. The smaller line is the vent line to the charcoal canister that mounts behind the passenger side headlights. If the car had fuel return, it would have had THREE steel lines on the frame rail. If you asked for a pump for a 455, you got the three line pump. Get a pump for a 350 with two lines (one inlet, one outlet).
March 21st, 2018, 01:37 PM
#8
Joe Ralph
Thread Starter
Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
Sorry, this is not correct. For a 1972 Cutlass, the 3/8 line is the feed line to the pump. The smaller line is the vent line to the charcoal canister that mounts behind the passenger side headlights. If the car had fuel return, it would have had THREE steel lines on the frame rail. If you asked for a pump for a 455, you got the three line pump. Get a pump for a 350 with two lines (one inlet, one outlet).
Last edited by 72442455; March 21st, 2018 at 01:39 PM. Reason: Typo
March 21st, 2018, 01:41 PM
#9
Joe Ralph
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Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
March 21st, 2018, 02:00 PM
#10
Old School Olds
Join Date: Nov 2008
Location: Marble Falls TX
Posts: 8,941
I also helps to roll the engine over where the eccentric is at it's lowest point
also as shown. This helps put less pressure on the pump arm when attaching
the bolt and nut if it has the correct bolt on top for the nut. There will be some resistance but that is normal.
also as shown. This helps put less pressure on the pump arm when attaching
the bolt and nut if it has the correct bolt on top for the nut. There will be some resistance but that is normal.
Last edited by tru-blue 442; March 21st, 2018 at 02:04 PM.
March 21st, 2018, 02:43 PM
#11
Joe Ralph
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Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
I also helps to roll the engine over where the eccentric is at it's lowest point
also as shown. This helps put less pressure on the pump arm when attaching
the bolt and nut if it has the correct bolt on top for the nut. There will be some resistance but that is normal.
also as shown. This helps put less pressure on the pump arm when attaching
the bolt and nut if it has the correct bolt on top for the nut. There will be some resistance but that is normal.
March 22nd, 2018, 01:14 PM
#16
Joe Ralph
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Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
March 22nd, 2018, 01:33 PM
#17
Joe Ralph
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Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
Actually that was a dumb question - sorry to waste your time - I was able to look at some images online to see what I needed - that an the inside view tru-blue attached and it’s pretty obvious - thanks all for your help this is EXACTLY what I needed! ~ Joe R.
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