fsvaasam

I have LS1 retrofit in my Nova and PSI harness sends relayed +12v-14,5V to fuelpump which is walbro 255 inline version. It make so terrible noise with normal current so i resisted the current to +9,5V and its been fine and quiet for few years with stock engine.

Now when im gonna make more power out of the engine i want to release fuelpump full capacity and i want to add fuel pump controller and dump those resistors.

What kind of controllers you are using and where you are getting signal for the controller??

I have found several controllers online, but not so sure how easy its to use with my set up. Specially to be sure with input signal.

S10xGN

iTrader: (11)

Where'd you get the Walbro? There are a ton of Chicom knockoffs out there...

fsvaasam

Pump came with PSI as my harness, regulator and plummings. Hard to say the real origin of the pump. I dont blame the pump. I can imagine that almost every pump is in trouble if you put full voltage in it and need for fuel is almost zero at idle without return line.

fsvaasam

I end up ordering this today. Lets see what it does.

http://www.easyperformance.com/produ...p-sensor-input

gsteele

How does that control the pump? Does it vary the voltage or is it a PWM unit?

fsvaasam

Its a PWM unit. Its the only controller what i found, where you can tune it easily with potentiometers. Initial power, start map and full map can be set the way you want, so i think its perfect for me. Im going to take input signal from TPS. It controls pump with narrow +12V pulses in idle and WOT its flat line +12V

bigmandengo

iTrader: (21)

Are you using a return style pressure regulator?

fsvaasam

I use this type of regulator, its with return line.

http://www.ebay.com/itm/99-04-C5-CORVETTE-OEM-GM-FUEL-FILTER-PRESSURE-REGULATOR-/260511946044?pt=Motors_Car_Truck_Parts_Accessories&hash=item3ca7b8d53c

stevieturbo

I can imagine every pump will be in trouble if you try and dead end it with no correct controls. That isnt a fault of the pump its purely down to a bad install.

If you have a regulator, then that should take care of the return. If you dont have a regulator, then you will need proper electronic PWM control of pump speed at all times.

I can see no sensible reason ever to just randomly drop pump voltage to say 9v.

fsvaasam

Thanks stevieturbo for reply! I have thought also possibility that i have something wrong with my routings. I use vacuum pump to fill the collectortank which goes to regulator and to the inline pump. Regulator return line goes to collectortank and collectortank have line to fuel tank with about 3mm restrictor. Restrictor is for the vacuum pump. Without it, vacuumpump pumps it self to death. Maybe the returnline from the regulator should go straight to fuel tank instead to collectortank?

stevieturbo

Draw a schematic of your system

fsvaasam

Of course my regu comes after the pressurepump to point my previous post. I try to take a picture and post it here when i go to my garage next time. Thanks.

stevieturbo

You're making references to vacuum pumps, regulators, collector tanks etc.

Draw a schematic of the entire system, it will make it easier to try and help when the exact layout/build of the system is known.

fsvaasam

This is my schematic. I can smell a problem here now. Maybe returnline should go freely to fueltank instead of collectortank.

fsvaasam

i mean regulator returnline.

gsteele

http://www.radiumauto.com/Multi-Pump...Tank-P271.aspx

You are doing it the same as Radium with the exception of the regulator being before the fuel rails which as I understand it is a matter of preference. Watch the video about half way down.

gsteele

There is also no restricting mechanism with Radium. I would think a pump controller would be appropriate.

fsvaasam

My vacuum pump is Facet red top and without backpressure it pumps like crazy. Thats why i have restrictor.

https://www.pegasusautoracing.com/pr...asp?RecID=8462

Im thinking there could lie my problem too with my walbro. It might need more pressure free flow from regulator.

Well, i have already ordered fuelpump controller. At least i have some options now.

stevieturbo

The schematic is fine. But why do you have a restrictor in the return from swirl tank to main tank ?


And by vacuum pump...surely you mean some sort of lift pump ?

You want the low pressure pump to have flow ability, remove the restrictor from the return. It should not be there. There is no need for silly controllers in such a setup either.

How far is it from reg to rails ? What size hoses etc ?

stevieturbo

What would concern me though is the Facet. It states approx 38gph ?

ie US gallon is approx 4 litres ? So that lift pump can only flow 152lph.

So no way in hell can it keep up with the walbro once the engine is above say 350-400hp. The swirl tank will be emptying.

You need a far better lift pump. One of the basic Carter/Federal Moghul pumps would be far better suited than the Facet.