how do i set up a mechanical fuel pump?
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
how do i set up a mechanical fuel pump?
I have a '90 motor in an '86 pump and i'm having too many issues regulating the in tank pump down to 5psi for the carb... i want to run a mechanical pump - i've read that my hot cam has the lobe for it -
how should i set up the pickup in the tank? can i run a hose from the metal line right to the bottom of the tank?
how should i set up the pickup in the tank? can i run a hose from the metal line right to the bottom of the tank?
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
You'll need a fuel pump mounting plate, and a pushrod. The mechanical pump should pull the gas right through the in tank pump so you can forget rigging a pickup.
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
Drifting
Joined: Mar 2008
Posts: 1,756
Likes: 0
From: Wichita KS
Mount an electric pump back by the tank that has a working pressure of 8psi. Pumps do not like to pull. So mounting it back as close to the tank as possible makes the pump push fuel rather then pull.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
fwiw, early 3rd gen F-bods ('86+ IIRC) with carbs had severe 'vapor lock' problems and GM installed an electric in-tank 'booster' pump in addition to the mechanical block-mounted pumps.
just change your existing pump to an 84 vette in-tank pump that won't push more than 15 psi.
just change your existing pump to an 84 vette in-tank pump that won't push more than 15 psi.
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
fwiw, early 3rd gen F-bods ('86+ IIRC) with carbs had severe 'vapor lock' problems and GM installed an electric in-tank 'booster' pump in addition to the mechanical block-mounted pumps.
just change your existing pump to an 84 vette in-tank pump that won't push more than 15 psi.
just change your existing pump to an 84 vette in-tank pump that won't push more than 15 psi.
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Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
do what redrose said. order a 1984-1986 F-body L-69 booster pump. they only made about 5psi. The electrical connector might be a bit different and you will have to add a bit longer rubber hose between the pump and the sending unit but it will fit no problem. I think that pump alone could support the carb.
Burning Brakes
Joined: Sep 2006
Posts: 1,142
Likes: 0
From: Spring Grove Illinois
Just a couple of questions.....Is your FPR a three way?? You need to return fuel back to the tank if useing a stock 86 FP...Also the stock return line is too small to handle the flow back to the tank...Now, you could reverse them,but you'll have to relocate the fuel filter(remove add a line and re place it somewhere else) ...Another thought...Does your cam support a mech fuel pump?? Some Hot Cams don't even have the lobe(Double check that)...Just some Thoughts
Last edited by Happydad; Mar 9, 2009 at 07:10 AM.
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
Just a couple of questions.....Is your FPR a three way?? You need to return fuel back to the tank if useing a stock 86 FP...Also the stock return line is too small to handle the flow back to the tank...Now, you could reverse them,but you'll have to relocate the fuel filter(remove add a line and re place it somewhere else) ...Another thought...Does your cam support a mech fuel pump?? Some Hot Cams don't even have the lobe(Double check that)...Just some Thoughts
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
No, the block is machined with an opening the shape of the cover plate and the pump is shaped similar to a diamond, you have to have the pump plate on there first. Summit has them.
