bowtieboy4life2000
1/2 ton status
I put a 87 engine from my blazer into my 77 sierra and i'am going to run a carb on it but the engine doesn't have a lobe for the manual pump on it. so what kind of electric pump can i run and not flood the carb
CK5
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fuel pump
- Thread starter bowtieboy4life2000
- Start date
mudbuggy
1/2 ton status
Napa carries an in line pump that is rated 3-6, and another that is 4-8. I bought the smaller of the two for another truck of mine that I removed the tbi and replaced it with a 4 bbl carb. I then realised that I needed more psi and bought the larger one. I seem to remember each was around $40 or close to it. The second one does the job, and the first one ( smaller of the two) I use as a transfer pump.
It depends on the amount of money you want to spend. The Holley blue pump w/regulator is the pump I usually run. Its a little more expensive than an inline pump but it comes with an adjustable regulator in case you needed more fuel pressure down the road. http://www.summitracing.com/parts/CMB-03-0067/
wasted wages
1 ton status
holley blue is a good choice....simple cheap,,dependable....
mount it to push the fuel...in other words mount it in the back by the tank....
use a relay to power it....the brushes in the motor will thank you...
mount it to push the fuel...in other words mount it in the back by the tank....
use a relay to power it....the brushes in the motor will thank you...
What carb are you using?
Holleys can take up to 7.5psi, meaning you can run a red top holley pump without a regulator if you're using a Holley carb.
Edelbrock Performers can handle up to 6.5psi, but really don't like more than 4.5psi, lest you run into intermittent flooding and occasional hard starts when the pressure pushes fuel past the seats. If that's the case, get the red top pump and the Holley regulator rated from 1-4 psi. I use this combo for a 1406 Edelbrock on a ZZ4350 and run a steady 4.5psi, truck runs/starts/restarts beautifully no matter the temperature.
For carbed vehicles, the blue top is a little much, IMHO. I've heard the regulators that come with this pump struggle to handle the PSI as well.
Holleys can take up to 7.5psi, meaning you can run a red top holley pump without a regulator if you're using a Holley carb.
Edelbrock Performers can handle up to 6.5psi, but really don't like more than 4.5psi, lest you run into intermittent flooding and occasional hard starts when the pressure pushes fuel past the seats. If that's the case, get the red top pump and the Holley regulator rated from 1-4 psi. I use this combo for a 1406 Edelbrock on a ZZ4350 and run a steady 4.5psi, truck runs/starts/restarts beautifully no matter the temperature.
For carbed vehicles, the blue top is a little much, IMHO. I've heard the regulators that come with this pump struggle to handle the PSI as well.
bowtieboy4life2000
1/2 ton status
its a stock qurdjet
I used to run a Holley blue pump and HATED it, it was super noisy and changed pitch all the time like it was about to die. It never did, but I would recommend just about any pump but that one.
Q-jets are fairly sensitive to fuel pressure, I ran mine at 2.5-3 psi. Too much pressure and it will hold the needle valve open and the truck will run super rich. Even with my built 383 I never ran the bowl dry at 3 psi, don't get sucked into the "is the pump flowing enough" deal unless you're running LOTS of horsepower.
Q-jets are fairly sensitive to fuel pressure, I ran mine at 2.5-3 psi. Too much pressure and it will hold the needle valve open and the truck will run super rich. Even with my built 383 I never ran the bowl dry at 3 psi, don't get sucked into the "is the pump flowing enough" deal unless you're running LOTS of horsepower.
wasted wages
1 ton status
They are noisy...I'll give you that....
I run one on my buggy but can't hear it over the exhaust anyway,,so no big deal...
as far as flow,, it kept up with my two 750 Holley's when I had the supercharger on it....
now with the single quadrajet,,,I have it cranked down to about 4 psi...maybe I should lower it....it does kinda run a little rich..
I never ran one with a Q-jet. I've ran them on the 4150 and 4500 series Holleys and never had a problem. I've even ran them as a seperate fuel system for nitrous applications and they keep up just fine. The thin rubber isolator it comes with doesn't do much for the noise, you might try a thicker rubber mount to keep vibration down.
My red top holley pump straight screams.
It uses braided line and if any of it happens to touch the firewall, man oh man, it sounds like I'm in a dragster in the cab.
WHHHAAAAAAAAAAAAAAAA
And the pitch changes all the time, it's never constant.
I should probably put a rubber isolator on the line.
It uses braided line and if any of it happens to touch the firewall, man oh man, it sounds like I'm in a dragster in the cab.
WHHHAAAAAAAAAAAAAAAA
And the pitch changes all the time, it's never constant.
I should probably put a rubber isolator on the line.
