Engine/Transmission (1998.5 - 2002) new fuel pump

[aharrow]

Ok another fuel pump question I bought an aeromotive pump and a racor fuel/water separator I want to eliminate the factory lift pump and filter the question that I have is powering the pump do I run a toggle switch with a relay or can you run the factory lift pump wires back to the new pump can someone explain the pros and cons of each thank you for any help Aaron

 

[Lsfarm]

Use a relay

Hi Aaron, when I install a pusher pump I tap into the hot lead to the factory lift pump, and use this to energize a relay, and use the relay power to run the additional pump.



I did the same with the FASS system I installed a week or so ago on a customer's truck. The relay is good for 30 amps.



The ECM and it's wiring carry all the current to the stock lift pump, the wiring looks pretty small, so I always add a relay and heavier wiring.



Hope this helps, Greg L The Noise Nazi



Ps. Check your Email

 

[rweis]

I have a RACOR 690 on mine pre lp and LOVE it. About once a week or two I "get out and get under" to check the bowl to see how the water seperation is going. Drained about 2 drops of water after 6 months.



I have often thought IF I got a bad load of fuel, I could drain it every 10 miles or so and at least survive.



I put my lp on the frame with a bypass regulator to keep the check valve ball seated. Seems to be just fine, but only 30k miles so far.



Bob Weis

 

[Big-D]

Bob,



By placing your LP on the frame rail, do you get any noise inside the cab when the pump is running?

Dave

 

[rweis]

Yes,



I put a high density 1/4" neoprene pad between the pump and the bracket, and between the bracket and the frame. Also put a pad between the washers / nuts holding the pump on the bracket (pump, pad, bracket, pad, washers & nuts). and the frame and the washers & nuts (pump bracket, pad, frame, pad, washers & nuts)



But it is really minor and I use it to reassure myself that the pump is indeed spinning. I can only hear it if I am stopped like at a stop light. I do not think it is comming through the frame (could be though), but from the lp itself since I only hear it when ther is no road noise.



Bob Weis

 

[CEkstam]

A bit of info for the fellas that are thinking of adding lift pumps to their fuel systems.



The intent of adding a higher flow pump is to increase the fuel flow rate to the engine potentially increasing performance and efficiency. Here are the problems. The flow of fuel from the tank to the pump is the job of Mother Nature. Fuel flow is driven by the force of atmospheric pressure on the surface of the fuel in the tank in an attempt to equalize to the lower pressure or vacuum of the lift pump. This is a very limited pressure differential and does not have much force. Additionally, the stock fuel line (5/16"ID) does not flow enough volume under these low pressures. The result is increased cavitation producing increased volumes of fuel vapor . This defeats the original purpose and results in lost power through increased levels of retarded injection timing and potentially more damage to your VP44.



If you are going to add a "pusher" pump, first be sure to increase the size of the supply line from your fuel tank. Another thought, by adding an additional pump you are adding another component that could fail. Either pump failing would block the flow of fuel and toast the VP44. For more info on a fix for this problem see Fuel Preporator at www.ekstamworldwide.com



Thanks,



Charlie

 

[ragullet]

Just put a fass on do away with lp and stock lines and as a bonus remove air from your fuel



ray