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Discussion Starter #1
Looking for advice on a fuel pump.
Have an 89 mustang with 460/c6 and 9 “ rear.
Currently the car has an el cheapo Holley or Chinese mechanical pump, as you drive the car the car the fuel pressure drops from around 8 or 9 down to 3-4 psi. Fuel feed from tank is a -10.

Engine combo is a set of ported D3VE A2A heads and performer intake with an unknown cam(supposedly ). 570 or so lift. And 230-240 duration. Rebuilt engine with forged pistons and mid length 2” headers with three inch exhaust.
And a Holley hp 750

Eventually would like to put on a good set of heads, intake and hyd roller cam and a victor or tfs dominator intake.(already have a dominator carb sitting here)

Has any had experience with a mechanical pump that will support 650 horse ? Im assuming the car puts down 400 or maybe a little more now and really like the idea of using a mechanical pump because they are easy to bolt up.

Is electric the only way to go as far as fuel pumps?

I saw that clay smith sells a pretty good looking mechanical fuel pump but have yet to find anyone actually running one of those pumps..?

Thanks
 

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Edelbrock makes a couple of good mechanical pumps. The RPM doesn't require a regulator, and the Victor does. I've used both on ~650HP engines. If you're looking for more than the Victor pump can supply, there was a guy here (psquare75) who detailed how to convert the BBF Carter pump to 172 gph by using the parts off a Carter BBC pump. Beyond that, maybe look into a belt driven pump if you really want to stay mechanical.

An electric pump with a return style regulator is really the way to go though, especially with all the future mods you listed. Holley's new HP line has worked well for me.


,
 

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Mechanical Fuel pump

I agree with CarsbyCarl

Go with a Holley electric pump. I'm using a 12-800 for my bored & stroked 460 (504 cuin)

it will support up to 650 hp and can used with a carburetor or efi system such as the holley sniper or FiTech

so if you start out with a 4159 carb and later decide to switch to EFI you can use the same pump
 

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Discussion Starter #4 (Edited)
Ok thanks,

Next question is about the fuel pump pickup tube that drops in place of the stock electric pump that cars such as the mustang have.

I keep being told that pumps arent made to draw from those types of tubes.

I really didnt want to sump the tank or put a fuel cell in it at this point was the only reason I was thinking about the mechanical...


Any experience with the above , a pump sucking from a pickup
 

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Mechanical Fuel Pum

in all of my performance builds (Pontiacs 400 & 455, Ford 429 & 460)
current Ford 460 Bored & Stroked to 504 cuin.
I've always used electric fuel pumps.
Now there are certain classes of racing where the rules state you MUST use
a mechanical fuel pump and those pumps are just as pricey as an electric
fuel pump.

You can go with an in tank electric pump this is what all the auto
manufacturers do.
Most performance companies such as Holley offer in tank pump kits
for most popular vehicles. So you don't have buy a fuel cell or a specialty
tank with a built in sump.
 

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Clay Smith cams has big GPH mechanical fuel pumps for 429-460 Fords.......On eBay you can get roller fuel pump eccentrics too. The reason the stock pick-up tubes aren't recommended is because of the small size as compared to what is needed for a full flow fuel system. You could easily make a larger pick up tube assembly by replacing the stock tubes with larger ones using the stock fuel tank/fuel pump cover. Keep the pick up close to the bottom of the tank and make a 90 degree bend at the bottom and cut the end of the tube at an angle......Hope this helps.
 

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A mechanical fuel pump uses vacuum to pull fuel from the tank. It's very difficult for 5 to 6" of vacuum generated to over come the weight of the fuel in a-10 line under hard acceleration. The fuel will try to return to the rear of the car. Try a -6 line and your fuel pressure should stabilize.
A belt drive pump is not an efficient pulling from rear tank, would need to use surge tank or move fuel tank to front of car.
 
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