My 255 is starting to fail on my Boosted K20 EG and seems to be drawing a lot of amps, taking power away from other areas. Its on the stock harness right now. Gonna upgrade to a 400 pump and ive been told to wire in a relay and upgrade to a different gauge wire. Did some searching and 8-10 gauge seems to be the popular choice with 30-50amp relay. My question is does anyone have a NAPA part number or suggestion as to what to get? Car made just under 600 at around 30psi, precision 6262sp, kpro, Sunoco 112 fuel, precision 1000's. I don't run it that high often, mainly its on a 400hp street tune on pump gas.

Also heard I can buy a connector for the larger diameter wire? Not sure where to look for this if its available.

 

in for info.

 

14ga is all that is needed, max current draw on that pump is 20.2A @13.5V at 120PSI.

Upgrading the stock fuel pump pwer lead to 14ga is all you should need to do, replace the fuel pump pwer lead from the PGM-FI Main Relay to the fuel pump plug. 94

 

See what the 450 guys are doing.



https://honda-tech.com/forums/forced-induction-16/walbro-450lph-users-unite-3139056/

 

Ive got a 30amp relay and gonna run 12GA wire. Was confused on how to upgrade the wiring inside the tank but figured out how to get all that apart. Now just gotta find the right pin connectors and make this all work. If I get around to it, ill do a small write up on this since I cant seem to find any on here.

 

12ga wire has a 40A capasity, your Walbro will never draw 1/2 that, as mentioned max draw on that pump is 20.2A at 13.5 and 120PSI.

There is no point in running a 12ga. it gains you nothing, but hey it's your car. 94

 

I understand it shouldn't draw that much amperage. But after reading through the 400 thread as well as some others, a few people were mentioning they had problems with 12ga getting hot and melting the wire. I don't know how they wired there stuff in. Being its in the fuel system id rather be safe than sorry. 10ga wont hurt anything, so I might as well just to be cautious.

 

The momentary in rush current is ~35 to 40 amps on a 450. I recommend have a higher capacity wire. The value you are quoting is steady state. The transient values are higher as people have been experiencing.

 

12ga is good for 40a free aired or for extremely short distances. I ran paralleled 40a 5 pin relays for redundancy reasons using 10ga wire to a trunk mounted battery.

I tested the 450 pump on the dyno and at 13.1v and 72-75psi fuel pressure (absolute) I was at 33amps. This was with a full tank of fuel (makes a difference due to motor heat retention/cooling)

Any substantial run of #12 wire on a 3pa relay will result in failure, how long? It all depends on ambient temps, fuel levels, absolute fuel pressure ran and alternator/battery condition.

Jerod

 

Ive got 12ga with a 30amp in there right now. Gonna go on the dyno thursday so ill see how it does. If it becomes a problem, i can always upgrade if need be. As long as it holds up on the dyno, ill be happy. Id rather not have the wiring become an issue because its a waste of time and money on the dyno