Just trying to see what kind of pressure everybody is regulating their lift pump setups to.

I'm used to the Cummins Bosch VP44 pumps, and they'll only handle about 25 psi before they spit out the front seal. I would say that the HPCR pumps are capable of higher pressure just by looking at the prints in my bosch manual.

So....

Who's pushing 20+ psi at their HPCR pump?

Thanks in advance,

Brayden

I am running about 15 psi through my Holley "Black". Been told no more than 15 psi (not sure if was a performance issue or a limitation). Hope this helps.

Remember on the suction side of the high-pressure pump there are some lame little spring-type hose clamps that you can pull off just by tugging on the hose. Take a look at the hoses on the filter head and you will see. I keep an eye on mine at 8 psi.

I seem to remember someone telling me that above 15psi the priming unit on top of the factory fuel filter goes pop.

The max pressure is open for debate but here are a few facts to help you make your decision. Max pressure for the filter primer pump before failure of diaphragm 15 psi. Max pressure on EDU before cases begin growing 5 psi.

What's an EDU?

It's the control unit for the injectors that's mounted on the passengerside above the valve cover towards the front.

You can't hardly run any pressure then without hurting the edu? Still limited by what the mechanical pump can take in anyway aren't you?

What's an EDU?
Electronic Driver Unit
It receives fuel timing commands from the ECM and provides the amplified signal required to fire the injectors. It's the first componet the fuel sees as it leaves the tank. The fuel is used to cool the EDU.

The correct "GM" terminology is the FICM (Fuel Injection Control Module).

I'm going to push 15 or so at mine. I'm really thinking about doing away with my factory filter assembly, so that would eliminate one problem. Especially with the dealer charging $40.00 for them at a 5000 mile life expectancy before the P1093's start.

Thanks for the info guys.

Been running a Holley Blue on mine for a year without a regulator. I believe they run around 14 psi.

Good to hear that. That's the pump that I ordered.

Here we go again. :smashfrea

Why the high PSI. All you need to accomplish is the filling of the LP pump during hard acceleration/increased fuel vac situations. Why push the envelope of the other componets? Enough volume is the key. Once you fill the LP side of the injection pump you are done as fluid will not compress. One gallon of fluid under 8 Psi and one gallon under 15 Psi is still one gallon. Unlike gas or air.

I have read a GM article that suggested anything over 20PSi will actually damage the factory low/high pump.

When it starts to runn funny at idle you are too far. I only had a 15psi gauge handy when diagnosing a problem for a guy with too much psi, and it was more than that...

The only thing that is needed is to fill the low pressure section of the factory pump. You need enough pressure to allow the pump segments to fill completely in the aloted amount of time they are open for filling. This amount of time decreases as RPM increases.
Now the question is what is the necessary pressure to move a fixed volume of fuel through a fixed orfice in a given amount of time? When you answer that question you will have the answer to how much is enough. A poor mans way to look at it is on the engine dyno under load we watch the control valve position and correct from there. The supply system truely need to deliver fuel based on the demand of the engine RPM (low pressure pump RPM)without hurting other componets in the process.
Simple enough.:D