bigbrdf250

iTrader: (2)

i installing the dual walbro 340s and dont really want to tinker with the wiring as i am not that great. one will be off the hot wire kit when i but one and the other i want to tap into the same wires on the kit. i already hears it will melt the wires.

my car will not be street driven and will only see short idle times and few
passes down the track. no steady street driving to heat up the fuel.

how are people wiring the second pump if not using an hobbs switch??
ultimatly i could wire it on the n2o activation switch so when i do flip the switch to activate i will then turn on the second pump, thats a thought.

just looking for somethin easy and reliable and that will give me the proper voltage when needed.

SirNemesis

I'm using a Hobbs switch with a small run-on delay circuit with mine, but I'm using 044's which use a lot more power than Walbro's. I'd just leave both of yours running all the time for simplicity.

bigbrdf250

iTrader: (2)

So do u think I will be safe for the most part?? It will be easier to hook them up together for sure

stevieturbo

Just run them all the time. Simple.

bigbrdf250

iTrader: (2)

thanks guys for the help

06blackGTO

iTrader: (20)

Yep. All the time will not hurt. I just bought my camaro. and the stock fp went out on the prev. owner. So his dumb azz cut a pretty big square above the fp in the hatch. and cut the fuel line and mounted 2 external fp's in the hatch area above the tank. And I dd. it, it's noisy but it runs fine.

djfury05

iTrader: (30)

I also have dual intank GSS340's going in. I bought the 99-02 Racetronix hotwire kit for one of the pumps. I will be making another DIY hotwire kit for the other pump and I am going to have the trigger be a MSD 8969 RPM window switch. Couldn't think of a better way to do it since I am NA with nitrous later on and I won't be using a Hobbs switch.

As far as wiring up both pumps together, well personally I'd feel much better if I knew each pump was getting the full voltage offered by the alternator rather than to split the voltage between the 2 pumps since low voltage will cause more wear and tear on the pumps as I've read.

stevieturbo

If you use shitty wiring practices then that will happen no matter how you do it.

Don't use shitty wiring practices.

Cronic_Moronic

Just wire them with large enough wire to pass the current without issues.

Racetronix

iTrader: (2)

We do not recommend running two them all the time. It doubles the electrical pump load, heats the fuel much faster and puts unnecessary wear on your secondary pump. Running two pumps at once typically requires an upgrade to the return system to prevent a pressure rise and excessive pump head pressures which will lead to premature failure. Each pump should be wired into a dedicated fused circuit. 20 amps for Walbro 255LPH pumps and 25 amps for 340LPH pumps such as our RXP340M.

We offer a wide assortment of pumps, accessories and wiring solutions to help you complete you system:
http://www.racetronix.biz/itemdesc.a...PH-001&eq=&Tp=
http://www.racetronix.biz/itemdesc.asp?ic=HPS-4&eq=&Tp=
http://www.racetronix.biz/items.asp?...atus=0&Tp=&Bc=
http://www.racetronix.biz/items.asp?...atus=0&Tp=&Bc=

stevieturbo

Whilst there is some reasoning behind that...I still disagree.

Keep things simple. Ive been running my 044's for about 5-6 years now and never a problem. Ive driven 400+ miles almost non stop ( stopping just for fuel ) with no issues. Build it right and running both all the time poses no problems. One relay, one fuse. Normal current is around 22A, rising to a max of about 26A. Ive never blown a single 30A fuse yet.

Now I can see why some would like one relay and fuse per pump. Yes it does make sense from a wiring and electrical safety point of view in theory.
However...should one fuse or relay fail at the wrong time, you stand a good chance of destroying your engine.
In my case if the relay or fuse blows, my engine stops.

Keep it simple IMO.

The 340lph and upwards pumps are more awkward though. They draw ridiculous amounts of current, and once past about 70psi, dont really flow any better than an 044 anyway.

Racetronix

iTrader: (2)

Chances are that if the current rises to the point where a single fuse blows there is a good chance one of your pumps is failing so your fuel volume will be down to begin with. There is also the fact that the system pressure does not instantly drop and shut down your engine under WOT if the fuse where to blow. All it takes is a few milliseconds under reduced pressure to take out a cylinder.
With a dual harness:
- Each pump can be checked and monitored for current draw, pressure capability and volume.
- A failed pump is easily isolated
- The car may be driven with one pump circuit operational
- Indicator lamps may be added to monitor each circuit
- An electrical fire would be far less likely using two smaller rated fuses on each pump circuit.

Lonnie’s Performance has sold well over 1000 dual systems using our PnP harness, which is a true testament to the reliability and safety it provides.

stevieturbo

The Walbro's are reliable little pumps, there's no doubt about that.

So do you offer a kit that allows real time current monitoring, or what way do you achieve that ? Is the warning light linked to this to alert of current irregularities ?

It would certainly be a good feature

gpr

iTrader: (6)

I didn't know you offered a dual pump wire harness. what is the part number i didn't see anything on your site?

Is this harness for dual pumps in the tank?

Monte4ever

iTrader: (2)

They have a damn good dual pump wiring harness. The one I have turns on the second pump via a hobbs switch but I'm sure they can build you a harness for whichever way you want to turn on your second pump.

Racetronix

iTrader: (2)

We manufacture PnP DP harnesses for almost every GM application but most of them are not sold to end users as DIY items. We tried this in the past and were bogged down with many people in over their heads requiring tech support.

Lonnie's Performance uses all our pumps and wiring solutions in his drop-in PnP systems.

We do sell many components in our web store that will make a tech-savvy customer's life much easier such as:

Dual Relay Power Harness
http://www.racetronix.biz/itemdesc.a...PH-001&eq=&Tp=.

Universal Bulkhead Wiring System, 4-Way
http://www.racetronix.biz/itemdesc.a...WS-001&eq=&Tp=

FUEL PUMP INSTALLATION PARTS
http://www.racetronix.biz/items.asp?...atus=0&Tp=&Bc=

WIRING COMPONENTS & AIDS
http://www.racetronix.biz/items.asp?Cc=WS&Bc=

Here is an example of a DP kit we sell to TR owners:
http://www.racetronix.biz/customkiti...kc=DPK-003&eq=

Most TR owners now buy our complete DP system:
http://www.racetronix.biz/customkiti...FS-G7680AN&eq=