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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > General H2 Discussion

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  #1  
Old 11-06-2008, 09:50 PM
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Default Re: Fuel Filters? Loss of power...supercharger

Thats wierd cause i just replaced mine not too long ago. Heres a picture you can only see one of the lines cause both lines run right behind one another. This is the part number i got: AHG9344

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  #2  
Old 11-06-2008, 11:17 PM
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Default Re: Fuel Filters? Loss of power...supercharger

Do you have any guages? Wideband, fuel pressure, boost? Could be alot of things but I would guess that if you have good pressure then thats not a fuel problem. Better gas will usually equal more timing/power. Any belt dust? Maybe slipping belt, spinning crank, vacuum leak, etc. Have you thrown any codes?

Alot of the fuel filters are located above the crossmember under the center of the truck. Mine is atleast.

Tim
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  #3  
Old 11-07-2008, 12:19 AM
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Default Re: Fuel Filters? Loss of power...supercharger

Try going to premium fuel (which is recommended with the SC) and use an injector cleaner like Techron. I had the same problem and it turned out to be bad fuel. Now I only run Chevron or Mobil premium.
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  #4  
Old 11-07-2008, 01:20 AM
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Default Re: Fuel Filters? Loss of power...supercharger

Yea, true....maybe because of the 85/87 ive been running its been backing way off on the timing causing a power loss., since when i first installed the SC i ran 91 and it ran good enough to kill a transmission in a few weeks.

Next tank ill run preminum and see what happens.

--John
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  #5  
Old 11-07-2008, 06:58 PM
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Default Re: Fuel Filters? Loss of power...supercharger

Running a supercharger on 87 octane in my opinion is just crazy, even conservatively tuned its still a bad idea. You have all that money invested why not spend another few bucks per tank and have the piece of mind.
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  #6  
Old 11-07-2008, 10:55 PM
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Default Re: Fuel Filters? Loss of power...supercharger

you don't run cheap gas in a supercharged or turbo charged vehicle ,step up to 91 or 92 octane. throw a can of Seafoam in the gas tank and it will clean the injestors and remove carbon deposits,nothing I have ever used works as well as Seafoam .you might consider a Walbro fuel pump ,it will deliver all the fuel you need .
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Last edited by IRA51 : 11-07-2008 at 11:07 PM.
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Old 11-07-2008, 11:05 PM
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Default Re: Fuel Filters? Loss of power...supercharger

I forgot to add also that just because you dont hear it pinging that does not mean that your not running too lean. If the premium fuel with higher octane does not do the trick I would suggest getting a fuel pressure gauge hooked up to see if your getting pressure under throttle load, if pressure is good the next step I would take is getting a wideband A/F on that thing and see what the true air/fuel ratio is, with a forced induction set up I would be scared of anything in the neighborhood of 13:1 or higher. Another thing you may want to do if its not done already is get a plug that one heat range cooler along with tightening up the gap by .010

Im not just giving you this info blind..... I have owned a couple of supercharged cars along with having alot of nitrous experience, under artificial asperation you want to be on the rich side vs. lean for safety.
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2008 H2 SUV Luxury: Solar Flare ext/Black int

SOLD 2006 H2 SUV Luxury: Pewter ext/Black int.

2002 Corvette Z06 Blue/Ebony (light mods)
1/4 mile: 11.661@118.86

2013 Audi S4

2002 Yamaha YZF R1 Blue/White
1/4 mile: 10.51@136

2006 Sea-Doo RXP (70.6mph GPS)
2005 Sea-Doo RXT
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  #8  
Old 11-07-2008, 11:12 PM
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Default Re: Fuel Filters? Loss of power...supercharger

GSS340 Hi Flow Fuel Pump

(Click to enlarge) Product: #Walbro GSS340 - GSS340 Hi Flow Fuel Pump
Price: $119.99
Category: Fuel & Cooling
Availability: In Stock
Manufacturer: Walbro
Weight: 2.00


Great in tank pump for forced induction



The Walbro high output in-tank electric fuel pumps are available in flow ratings of 255 liters of fuel per hour. These particular pumps flow significantly more fuel at higher pressure. For example, at 80 PSI the standard 255 lph pump will flow around 132 liters (35 gallons) per hour. At that same 80 PSI the equivalent HP (high pressure) fuel pump will flow over 210 liters (50 gallons) per hour.

Walbro in-tank electric fuel pumps utilize a proven gerotor design. The outside dimensions, however, are compact enough to fit existing hanger assemblies, without modification. Coverage includes most popular Acura and Honda, and many other Import applications.

These are complete fuel pump kits and include all drop parts, accessories and installation instructions. Also included is an inlet filter that meets or exceeds original equipment specifications and provides improved filtration and durability.

http://www.gonicd.com/intankinstall/intankpumpinstall
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