4SFEDSS

iTrader: (19)

What psi should I get get the hobbs switch set up for on my second pump. Im planning to run about 10lbs with my set up and I think the first walbro might be pretty much maxed out at that level. I was thinking maybe a 5 or 6 lb hobbs switch just to be safe. Does that sound about right?

nnracing

iTrader: (20)

I am doing the same build and my new fuel system has 2 pumps and the hob switch comes in at 4-5 lbs boost to kick the other pump on.

ls1290

iTrader: (20)

Depends on the size of the pumps.

Silver_TransAm

iTrader: (2)

I was thinking about doing this as well with my second pump.

Also what about having the pump come on when I activated my boost controller?

Frost

iTrader: (45)

I run 1-2psi switches on the cars I setup with 2 walbros... what advantage could possibly be had by waiting to bring on the second pump (again, assuming 2 Walbros)? ...Seriously I'm asking, I haven't even pondered it, but I can't see one. It's seamless and you never know it even happens except that your fuel pressure stays solid.

Silver_TransAm

iTrader: (2)

Where can i find these 1-2psi switches at? I cant seem to find them.

ChevyChad

iTrader: (50)

I got a boost referenced switch on ebay for like $11 and it is adjustable. I have mine set to 1psi, so the second it comes into boost, the second pump kicks on. It is the FPR's job to limit the pressure, so no need to play a guessing game on what psi it actually needs the extra pump supply.

4SFEDSS

iTrader: (19)

I just didnt want to work the regulator too hard but it probably wouldnt be a problem. Using a 1-2lb switch would be be a good idea, especially as a fail safe if the primary pump ever went out for some reason. And yea, theyre 2 255 gph walbros.

stevied916

iTrader: (30)

*** Non sponsor link removed ***

1-3psi

75tonyA

iTrader: (6)

how many psi of boost are you guys running? At what point are dual pumps needed?

ZLEEPER

iTrader: (24)

I thought the reason/advantage for the hobbs switch was soley to save wear on 2nd pump and recuce fuel temps during non boosted operation? Why else wouldn't you want it to come on almost immediate into boost?

Bmotorsports

We only offer the sealed, connnector type Hobbs switch version of this switch as the ones sold by most retailers do not have sealed connections which is wholly inappropriate for an automotive application. You should use the sealed, connector type Hobbs switch for any automotive application like the ones LSxTune offers.

speeddemon651

iTrader: (8)

have you ever looked at a Spek Fuel Psi gauge, It can controlled output for a second fuel pump and is 100% adjustable.

lt170chevelle

iTrader: (2)

Sometime soon i plan to add another walbro in my tank but dont see any reason to have it kick in any higher than a few pounds.I personally would want both to be on the moment of boost just to ensure steady fuel all the way up. It seems pressure would have to fluctuate a little if you have it come on at a set psi higher than the initial boost come on.I dont think to many of us is in boost all the time so i think 1-4 psi would be an optimal point to set an additional pump to turn on.

pwrtrip75

iTrader: (8)

Like frost said why would you want to delay when it comes on? How long does the pump take to build pressure?....versus build boost? I would want the lowest activated switch available like .5 psi. So you know by the time it got up to boost your pump would be at full load.

Im running twin walbro 255's also.. Im not even running a switch, both run all the time. How much heat could 2 little pumps make versus 1 big pump? Im not too worried.