General Category > Quadrajet Carb Talk and Tips

Fuel pumps

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hiy_po:
I have a Low pressure high volume intank Pierberg fuel pump.
130 LPH at 0.25 Bar (3-1/2 PSi)
220 at When used as a pre pump
I am looking at adding a second external pump.
What would be the better choice for use with the Quadrajet. Keeping in mind it is a boosted engine so at 15psi WOT it does suck down the juice.
1) 102 LPH flow at 5-9 Psi, and will self prime and lift 500mm
2) 100 LPH flow at 3-5 PSi, and will self prime and lift 500mm

Both pumps are German Pierberg

I am leaning toward number 2.
The other consideration is my fuel tank has an internal swirl pot. This is kept full by the returning fuel being fed threw a ventury that draws the fuel from main tank into the pot. The pot stays full regardless of fuel level in main tank

What yas reckon???

hiy_po:
also this one with a big jump in price but notice the others are 3/8 in and out, this one is 1/2 in 3/8 out

3) 95 LPH at 1 Bar (14 PSi) 1.8 Bar (max)

Cliff Ruggles:
What is the carburetor part number that you are going to use?

hiy_po:
 17059595

 Is the simple answer but such an easy question can get a complicated answer. That is the carby I have fitted up now and is nicely tuned for its purpose.
The problem I have with it that is low vacuum at cruise not operating the APT circuit.
 I have collected a few  7045281 earlier carbs and am thinking one of these without the power piston and needles and feed blocked, 68 main jets with MAB reduced to suit will work better. I would be more reliant on the secondaries for enrichment and aim for around 15:1 AFR cruising on the primary main curcuit. I dont know if that makes a difference to my original question on adding the second pump but just putting it out there.

Is fitted with 0.135 N/S I also have 0.150 spare parts.

Kenth:
Sounds like you are running boost at cruising speeds?
Is the carb pushed thru or pulled thru by boost?

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