I am in the process of getting all my pieces together for my fuel system. I am planning on running a 5/8 line to my 41401 pump/filters then a 1/2 to a Y block and 3/8 to either head.

What size return lines are you running?

Can you run the 41401 off factory wiring/relay safely?

Im running the 41402 off the factory wiring/relay and havent had any problems. I ran 5/8 line to the pump from a sump and then run 1/2 up to the motor then it necks into 3/8 as it goes into the itp bowl delete system. I just ran a 3/8 line back to the tank as the return and all seems good. I have not ran the pump on the full speed, just the low speed and it holds 65 psi without dropping 1psi at wot.

If its the one from dennis, the factory wiring is not large enough. I ran 10 gauge wire from the battery to a relay triggered by the factory wiring, and then to the pump, ground back to the battery. I also used a 30A inline fuse.

Aggie, what size sticks are you running?

Read the directions and run it at 1/2 speed. You shouldn't need any more fuel than that and it will be easier on the pump and wiring.

I have a 3/8's return line, and it seems to be doing just fine.

I would run a relay and 10 gauge wiring to the pump so it can get all the amperage it wants, with a 30 amp fuse.

racehauler, is the reduced speed actually 50%? I'm wondering if that is enough if you have larger injectors.....

Dave

Dave, i'm running mine on the reduced speed from dennis, and its only dropping 4-5 psi at WOT with 370/400 hybrids.

Ah, in that case, my little 275's should not be a problem. I assume this is the newer version of the pump, with the ring terminals?

Dave

im running 285 hybrids with cleaned up 200%'s.

Guess i should check out the wiring, but mine has been fine so far on the stock wiring. mine is the next size up pump set at slow speed.

Yes its the newer style.

I also run a separate 30a relay triggered by stock wiring. I also currently run mine on half speed but it is not enough, pressure drops at wot. Yes my injectors are stupid big and stupid fast . One of these days I'll get a hobbs or a wot switch to kick the pump on high speed. More than likely I'll do a hobbs set at 50 psi or so.