Returnless Fuel Pump Options

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09-05-2013, 09:48 AM

#11

03sierraslt

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Quote:

Originally Posted by cdub81

So I've searched and read and read... I'm really not wanting to convert to a return style system.

05 Sierra Lq4, cam, heads yada yada. Puts down 400 NA. Gonna put some nitrous through it and I'm sure the stock pump isn't gonna pull the load.

Soooo, what are my options for fuel pumps?

A walbro 255 will work just fine for you.

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09-05-2013, 09:50 AM

#12

03sierraslt

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Quote:

Originally Posted by dick_landy

He has a returnless fuel system.

I'd like to see someone try and take a CTS-V 65psi relief valve and see if it fitsput in a truck pump. Then I'd imagine you could raise pressure in the tune.

That's fine at WO but at idle 65psi base pressure and big injectors will be interesting as you will chase your tail trying to get them to pulse low enough.

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09-05-2013, 11:16 PM

#13

cdub81

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Quote:

Originally Posted by Vortec350ss

I've heard a lot of conflicting info too. I've heard that anything over a 255 will overpower the stock fuel pressure regulator on a returnless fuel system. I have also heard of people running an aeromotive 340 successfully. I hadnt heard of the aeromotive overheating issues on a DD. That's good to know. I had been considering a larger pump because of the success stories I heard with it... but this makes me think twice.

I know a few people who run dual 255's with a hobbs switch to turn it on when they hit a certain boost level.

Bottom line is if you are OK with the stock pump now, the 255 will be a big improvement. Sounds like that is probably the best option.

I haven't put a pressure gauge on the rail but at WOT I don't get lean. I've dynoed it at 400 rwhp and it was good but I'm not sure its enough once I throw some N20 at it. It's the factory pump with 160K on it. 100 shot to start then go up... I know... Baby steps!

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09-05-2013, 11:19 PM

#14

Atomic

I have a gauge for that

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Funny its called returnless...it actually is returned, it just never leaves the tank to do it!

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09-06-2013, 08:49 AM

#15

Vortec350ss

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Is there any way to just put in a stronger fuel pressure regulator in the tank? It seems to much easier to just run a walbro 450...

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09-09-2013, 07:46 AM

#16

Vortec350ss

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Also... another thought. If you run dual pumps on a hobbs switch, what would the problem be with running a single 255 until a certain boost level, say 5#, and then having a 450 kick on? Would it just overpower the 255? Are there other problems I'm not thinking of?

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09-09-2013, 05:39 PM

#17

Atomic

I have a gauge for that

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Would work fine.

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09-26-2013, 09:37 PM

#18

cdub81

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I contacted Racetronix and Emailed them my VIN #... They have a hotwire kit but they said there isn't a plug and play option for the fuel pump? So I'm guessing modifying the bucket?

2005 GMC CCSB

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