Ive been working on a friends car for a couple months. I rebuilt the engine, removed emissions, and installed a new RB Holley 465 kit. The car is still running on the stock fuel pump (barely). It starts and idles fine, but when you take it over 3,000 RPM it cuts out. (for obvious reasons) We ordered a Mallory pump from RB, the one that says it's pre set to 6 PSI and does not require a regulator unless your racing. This is a point A to B street car. Will it require a regulator? This is my first Holley experience.

 

The mallory is internally regulated so technically no, you dont need one if theres never anything else going on in the fuel system. But things like pressure creep, spikes, and electrical load can affect the pumps output and the needle and seats at the carb. Id spend 20$ on a cheap holley regulator and be done with it, ive used one for years with no issues. Plus knowing exactly how much fuel pressure is at the carb after the bends and length of the fuel system is nice for carb tuning! Especially the holley, which doesnt like letting you know the difference between 4 psi and 10 psi without a gauge. The needle and seats will hold all the way up to 14 psi without flooding over, but at that much flow the float drop might be a bit off for the intended tune.

 

Good to know. FYI we knew the stock pump would be insufficient. He had already spent $2500 between the engine and carb kit. We just wanted to get the thing started before dumping more money into it.

 

I just know with my weber experiences a regulator is a must.

 

i'm not running a regulator with mine... it turns out that the carter pump isn't strong enough to need one. i want 4.3psi, and the carter delivers 4.2...

 

Please tell me you're joking about wanting 4.3psi instead of 4.2psi?

 

Before ordering anymore parts check the secondary fuel level, It sounds like its low and doesn't enough fuel. keep in mind that electric fuel pumps work off voltage meaning higher voltage = higher pressure.

One last thing, STOP ordering universal parts from RB, You're paying at least a 20% mark up and longer wait to receive the order. I remember a friend of mine many years ago asking me if he should order RB spark plugs? I took the RB catalog away for being a dumb ***.

 

i have a P port, and the competition book wants 4.3psi and xxLpm, and the carter pump came in at 4.2psi, and about 3/4 the LPM that Mazda wanted.

.1 of a psi i'm totally fine with, the gauge probably isn't accurate to .1 of a psi.

so since i'm getting the PSI i want with no regulator, i have no regulator...

 

I thought your fuel pump was loud though? I thought the "loud" vane pumps produced plenty of psi/lph

And thats just memory of a video I watched of the pport at some point... lol

 

its not too bad? the car is actually pretty quiet, my T2 is louder... maybe i will talk next time so you get an idea of how tame it is