EFI Electric Fuel Pump

[CSX4815]

Originally Posted by lippy

I may be wrong about this, but I think most OEM pumps are located in the tank and do not have speed control. Those pumps remain cool by being immersed in the fuel and last 100k+ miles.

I agree but the A1000 is a higher performance pump for racing purposes than what's found in OEM applications.

I do think Weldon is a better pump but back in the day the A1000 is what was recommended by the shop helping with my EFI installation and setup. I do have a Weldon pump in my supercharged C5 Z06 along with a Boost-A-Pump... again a modulated controller that increases the output of the pump as demand increases. The last thing you want while under boost is fuel starvation. As i understand the BAP uses pulse modulation to control the pump and boost pressure when needed.

More about BAP here:
http://www.kennebell.net/KBWebsite/C...heory_kens.pdf

[PLDRIVE]

Lippy
What kills a fuel pump is heat and cavitation. OEM pumps are mounted in the tank to control heat and cavitation. They are designed to provide just enough fuel to get the job done. Fuel pumps mounted outside of the tank (after market) wear out prematurely due heat and cavitation (even Weldon pumps).
Bigger is not better. The Fuel pump should be big enough to handle the job but anything over what is required creates heat and aeration in the fuel.
For longevity and better performance controlling the speed of the pump will keep heat down on the pump as well as the fuel. Aeration will be reduced due to minimal fuel being bypassed back to tank. A poor designed fuel system will kill a fuel pump in a hurry.
Some of the most common mistakes i have seen. 1. Too big of pump. 2 Return fuel dumped right on top of pickup. 3.Too small of supply line to pump (supply line should be larger then output). 4. Pump mounted to high and to far from pickup.

[Cobra #3170]

Originally Posted by CSX4815

I agree but the A1000 is a higher performance pump for racing purposes than what's found in OEM applications.

I do think Weldon is a better pump but back in the day the A1000 is what was recommended by the shop helping with my EFI installation and setup. I do have a Weldon pump in my supercharged C5 Z06 along with a Boost-A-Pump... again a modulated controller that increases the output of the pump as demand increases. The last thing you want while under boost is fuel starvation. As i understand the BAP uses pulse modulation to control the pump and boost pressure when needed.

More about BAP here:
http://www.kennebell.net/KBWebsite/C...heory_kens.pdf

All a Boost-a-pump does is jack up the voltage, the ECU still modulates the grounding cycle. A better choice for boosted engines is the MSD voltage booster that is programmable to increase fuel pump voltage depending on manifold pressure. This helps increase fuel pump life by not operating at high voltage continuously like a boost a pump does.
I have two on my GT one for each pump and they do not increase fuel pump voltage until I am over 12 PSI of manifold pressure.

[CSX4815]

As I understand the BAP only boosts the voltage when under boost. I have over 12 years and 40,000 mi without an issue. Has worked fine for me. YMMV