Electric fuel pumps? (carb'd)

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motorholmes

Master Mechanic
Oct 1, 2007
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Looking into some electric fuel pumps to feed my 670 Holley carb. (5.3 engine with around 400hp) Wondering what you guys have used or recommend, and where to attach it to? I just removed a device of some sort, looks like an air shock suspension leveling thing (actually, I need to ask about what to do with that too) and I wondered if I should just bolt the fuel pump in it's place. But I read that you want the pump positioned below the gas level in the tank.

Also, do I need to worry about GPH? 60, 90..?

I'll probably run a separate regulator and a return line

Thanks :mrgreen:
 
Nobody runs an electric pump? I suppose, you guys all have mechanical pumps. I'd stick with that too if I were you :|
 
i have an electric pump on my elky. its attached to the frame in front of the rear axle on the passenger side. the pump is a holly red top and the carb i got is a 600 cfm. its worked this long, so i like it. its wired to the ign. port on the fuse box.
 
I'm running a 4.5 lb pressure pump with my ccc Q-jet, I'm making a shade over 300 h.p. at the flywheel. Mine is from Auto Zone according to the receipts and is close to 10 years old.
 
(quote from linked post)
dogshit said:
But some Gbodys came with in-tank electric pumps & baffled tanks like a new Vette would because they were fuel injected.

I'm going to look into this. It would be nice to get rid of the canister, and do the entire fuel system all at once.

Thanks guys for the help. I've never done a fuel system before, and just needed some advice :wink:

Keep em comin if there's more!
 
dogshit said:
But some Gbodys came with in-tank electric pumps & baffled tanks like a new Vette would because they were fuel injected.

So I'm assuming I need a GN tank, a GN sender, a GN fuel pump, and a regulator that will bring it back down to 6psi? And maybe some new tank straps too
 
Getting a baffled tank and fuel pump/sending unit from a 4.3L TBI Monte Carlo is the better route to go when running a carburetor. The TBI pump pumps 12-17psi @ 35gph which is plenty for a high performance V8 engine. Put a low pressure regulator on that and set it to about 5psi and you'll be good to go :mrgreen:

Now if you would rather not swap the fuel tank and sending unit and all ... you can install a standard in-line style electric fuel pump. Much easier and cheaper. Plus, you can buy one that only pumps 6psi and then you would have no need for a regulator :idea:
 
motorholmes said:
dogshit said:
But some Gbodys came with in-tank electric pumps & baffled tanks like a new Vette would because they were fuel injected.

So I'm assuming I need a GN tank, a GN sender, a GN fuel pump, and a regulator that will bring it back down to 6psi? And maybe some new tank straps too
Basically, and that's what I did to mine (mine is EFI and required 50 psi of pressure). Here's what I bought and had installed very recently:
All parts were looked up for "1987 Chevrolet Monte Carlo Base 6 Cyl 4.3L" <-- baffled tank and intank pump
- gas tank
- acdelco in-tank fuel pump (I heard is the most reliable over Wallbro or Carter)
- gas tank sending unit
The parts were actually not a bad price too. $84 for the tank, $56 for the pump

If you go the other route, I suggest either holley blue or holley red, and it'll supply more than enough fuel to your carburated engine, but you will need an inline fuel pressure regulator. Bear in mind, you will be able to hear the fuel pump every time it turns on, which is annoying. It has to be mounted near the tank, and yes, the fuel inlet needs to be lower than the fuel tank itself, because it's gravity fed, if you don't do that you will get fuel starvation problems.
 
454muscle said:
Bear in mind, you will be able to hear the fuel pump every time it turns on, which is annoying. It has to be mounted near the tank, and yes, the fuel inlet needs to be lower than the fuel tank itself, because it's gravity fed, if you don't do that you will get fuel starvation problems.
Very annoying :!: I will be switching my system to the in-tank setup in the near future

Tech recommends no more than 12" higher than the bottom of the fuel tank (as close to the tank as possible)
 
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