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Username Post: Selecting a stock-ish in-tank pump        (Topic#351425)
cloudmaster 
Senior Member
Posts: 1000
cloudmaster
Loc: Arrowsmith, IL
Reg: 01-30-02
06-04-18 11:58 AM - Post#2735905    

So, I have a factory '87 Chevy truck sender in an '87 tank feeding the (TBI Holley HP EFI) 454 in my '85 C20. When I set this up the first time a couple of years ago, a faulty valve spring broke during idle tuning, leading to catastrophic failure. I just got the engine back together and installed, but then yesterday when I went to start it for the "second first time", the fuel pump has died.

Thinking about it, that Spectre "stock TBI 350" pump probably isn't enough to feed a 550-ish HP big block anyway. When looking at more appropriate replacement pumps, though, everyone either suggests a "Walboro 255" or maybe an "Aeromotive 340". But there are half a dozen 255Lph Walboro pumps - some of which aren't even in-tank models, and Aeromotive must have used a time machine to find the web developer responsible for their web site. :D

I assume the Walboro everyone is talking about is the GSS342, but it doesn't sound like it's super reliable. I'm guessing Aeromotive is either the 11540 or 11541, but again, not positive (though I do have better feelings about Aeromotive overall). I really just want something that will fit the stock hanger without me having to fabricate much beyond the electrical connector, and one that might actually last. Can someone point me in the right direction?

'71 Malibu: 350/200-4R/3.73 Eaton posi
'75 Elky: 350HO/TH350/3.42 peg leg
'85 C20: EFI454/TH400/3.73 locker
'95 Caprice Wagon: LT1/4L60E/3.42 posi
'04 Grand Marquis: 2V4.6/3" pipes/SCT flash


 




Rick_L 
Honored Member
Posts: 27408
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
06-04-18 02:45 PM - Post#2735918    
    In response to cloudmaster

The Walbro GSS340, GSS341, and GSS342 are rated at 255 lph. Claim they will support 500 hp, don't know where that leaves you with 550 hp - whether there's enough reserve there.

The difference between the 340, 341, and 342 is the location/orientation of the fuel pickup. What you want is one to match the inlet style that your truck used.

Aeromotive has 3 similar pumps but they are rated a little higher. You may need to change the wiring for the pump to a bigger gauge because of that. (Might be true for Walbro too, since your stock pump is low pressure.)

Curiously I've heard the Aeromotive pumps are less reliable than Walbro.



 
cloudmaster 
Senior Member
Posts: 1000
cloudmaster
Loc: Arrowsmith, IL
Reg: 01-30-02
06-05-18 05:07 PM - Post#2736073    
    In response to Rick_L

Looks like around 11 amps tops for the Walboro, and I assume similar for the Aeromotive (since it's supposed to be a "stealth stock replacement"). At 14.4 volts, that means surprisingly tiny little 20 gauge would just barely be able to maintain 12 volts at the pump ten feet away - though you'd justifiably get some sideways glances if you did that. I ran 14 gauge off an individually-fused relay when I rewired everything (technically just "wired", since there was no pump there stock), so that part should be ok.

'71 Malibu: 350/200-4R/3.73 Eaton posi
'75 Elky: 350HO/TH350/3.42 peg leg
'85 C20: EFI454/TH400/3.73 locker
'95 Caprice Wagon: LT1/4L60E/3.42 posi
'04 Grand Marquis: 2V4.6/3" pipes/SCT flash


 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17185
grumpyvette
Age: 70
Loc: FLORIDA USA
Reg: 03-16-01
06-15-18 11:44 AM - Post#2737051    
    In response to cloudmaster

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 




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