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Bad Fuel Pump, get Walbro?

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Old Aug 22, 2013 | 09:57 PM
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Default Bad Fuel Pump, get Walbro?

So last year I put an LS3 in my 03 Z. Did head work, custom grind cam, FAST 102, blah, blah, blah...

Been having issues with the morons at PUR getting the tune done correctly, Was informed that car started loosing fuel pressure at about 5200, and had lost 10psi by 5800.
Got myself a used boost-a-pump, and was planning to install it figuring I was just running out of pump.

Recently car started really acting up, and pulling timing at 4k

Finally got it to a much better tuner, and fuel pressure issue has gotten really bad. Now I'm down to only 10psi total by 5k

So now I've got to get this dealt with. Tuner says he's got some parts coming in and a walbro 255 is on the list.

Anyone know if this pump will work in my 03? It's the pain in the a$$ fuel system that requires the tank be dropped for access
I'd really like to punch a GM engineer over that one....

This car had it's pump replaced under Good Will warranty about 5yrs ago for pretty much the same problem. I don't want to buy the ridiculously expensive stock pump(especially since they seem to be junk), and possibly need the boost-a-pump on top of it.

Can someone give me a recommendation on what to do here?

Thanks.
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Old Aug 23, 2013 | 09:03 PM
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Did I post this in the wrong section?
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Old Aug 23, 2013 | 09:17 PM
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At least you don't have to drop the rear end to get at it.

Count your blessings.

I installed the Lingenfelter in mine.

It does draw a bit more current so you have to check wiring if you run a boost a pump also.

I had to upgrade the wiring and fusing.
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Old Aug 23, 2013 | 10:26 PM
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Go to Racetronix. Buy and install their part number RFPK-008 for late C5s. It includes their "hotwire" wiring upgrade kit.

You will not be disappointed. Forget the BAP.

HTH

http://www.racetronix.biz/customkiti...RFPK%2D008&eq=
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Old Aug 24, 2013 | 01:10 AM
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Originally Posted by heavymetals
At least you don't have to drop the rear end to get at it.

Count your blessings.

I installed the Lingenfelter in mine.

It does draw a bit more current so you have to check wiring if you run a boost a pump also.

I had to upgrade the wiring and fusing.
Well that is what the recommended removal is. Have a Dealer mech friend who says he can drop the left tank without having to do so.

Originally Posted by LoneStarFRC
Go to Racetronix. Buy and install their part number RFPK-008 for late C5s. It includes their "hotwire" wiring upgrade kit.

You will not be disappointed. Forget the BAP.

HTH

http://www.racetronix.biz/customkiti...RFPK%2D008&eq=

Thanks for the link. I tried contacting Racetronix, but they have yet to respond to my email....and I did not see a phone # for them.

Have you used this pump set up before?
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Old Aug 24, 2013 | 02:33 AM
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Originally Posted by CarBoy
........Thanks for the link. I tried contacting Racetronix, but they have yet to respond to my email....and I did not see a phone # for them.

Have you used this pump set up before?
Yes. I have the pre-2003 version however, but the pump itself is the same. I also have the direct "hot" wire harness, which btw, is plug-n-play. No cutting, etc.

After dropping your tank and removing your existing fuel pump module assembly, the Racetronix pump (they use Walbro) installs directly into your fuel bucket.

Racetronix is in Canada and they have no phone number listed on their website, so e-mail is the only direct contact method with the company. They do however, have dealers here in the U.S. if you need to speak to someone. Texas Speed is one of them.

Of all the companies have whose products I have used, Racetronix is one of the best, most well designed and engineered, in the business. They emphasize reliability and their component selection and assembly shows this. Very good quality and fair pricing.

HTH
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Old Aug 24, 2013 | 10:24 AM
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Originally Posted by LoneStarFRC
Yes. I have the pre-2003 version however, but the pump itself is the same. I also have the direct "hot" wire harness, which btw, is plug-n-play. No cutting, etc.

After dropping your tank and removing your existing fuel pump module assembly, the Racetronix pump (they use Walbro) installs directly into your fuel bucket.

Racetronix is in Canada and they have no phone number listed on their website, so e-mail is the only direct contact method with the company. They do however, have dealers here in the U.S. if you need to speak to someone. Texas Speed is one of them.

Of all the companies have whose products I have used, Racetronix is one of the best, most well designed and engineered, in the business. They emphasize reliability and their component selection and assembly shows this. Very good quality and fair pricing.

HTH


Thank you for the info, it is greatly appreciated.
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Old Aug 24, 2013 | 10:38 AM
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Originally Posted by CarBoy
Thank you for the info, it is greatly appreciated.
Glad to help. When you eventually get your situation taken care of, be sure and come back to give a heads up so everyone can learn something from your experience, etc. That way, everyone with the "FFS" late model fuel system especially, can benefit. There's been a lot of non-FFS fuel pump related write ups or feedback on Corvetteforum, but very little from guys with the later design like you have.

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Old Aug 24, 2013 | 02:27 PM
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Originally Posted by CarBoy
....Got myself a used boost-a-pump, and was planning to install it figuring I was just running out of pump.
Poor choice IMO. Don't introduce a "used" part into the equation. You might just compound the problem if there is an issue with the BAP.
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Old Aug 24, 2013 | 03:23 PM
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Originally Posted by 1999_TRC
Poor choice IMO. Don't introduce a "used" part into the equation. You might just compound the problem if there is an issue with the BAP.
I agree with your basic premise regarding new vs used etc, but the main reason I don't think a BAP is beneficial here is based on the OP's particular set-up. If he were to be looking at 650-700 fhp and UP, then I think either a BAP that is WOT activated (or some pre-determined higher rpm) vs manifold vacuum activated, would be a good choice. Either that, or a dual pump from Lonnie's Performance would be even better. The main problem I have with vacuum activated BAPs on street cars, is that every single time you turn the key on, the pump is getting hit with 15, 16, or 17 volts until the engine fires. That's a lot of additional stress on the pump for a street driven car, especially a DD.
Of course you can use the adjustment **** but then that's just one more thing to do in the starting sequence each and every time you start your car. Always having to remember to fiddle with the adjuster ****. That really becomes a royal PITA for a street car. Dedicated track cars are different.
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Old Aug 24, 2013 | 03:23 PM
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Originally Posted by LoneStarFRC
Glad to help. When you eventually get your situation taken care of, be sure and come back to give a heads up so everyone can learn something from your experience, etc. That way, everyone with the "FFS" late model fuel system especially, can benefit. There's been a lot of non-FFS fuel pump related write ups or feedback on Corvetteforum, but very little from guys with the later design like you have.

Yes I will absolutely do that.

....on a side note....think you could introduce me to that girl in your avatar?
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Old Aug 24, 2013 | 03:26 PM
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Originally Posted by CarBoy
Yes I will absolutely do that.

....on a side note....think you could introduce me to that girl in your avatar?
Sweet dreams are made of this........
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Old Aug 24, 2013 | 07:32 PM
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Originally Posted by 1999_TRC
Poor choice IMO. Don't introduce a "used" part into the equation. You might just compound the problem if there is an issue with the BAP.
I have not used the BAP. I got it because I thought I was just too much motor for the stock pump, and had planned on it being activated only to the level I needed it and only at WOT.

But since I'm replacing the pump now anyway, I wanted a bigger pump so I wouldn't be in potential need of the BAP. Hense my original question about the Walbro 255....
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