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Hey guys... im trying to find a fuel pump for my cheavy 502 blowthru engine...I have a holly duble barel carb with 120 needles and seats.My engine is stock and my boost is around 6 psi...I found a el fuel pump but i will need a regulator so im sending a pic of the pump and hope some of you will tell me is this good or not...maybe some tips from you will help because im still new at all of this...thank you

 

You will need a regulator with that, return style close to the manifold is going to be the best bet. FYI those inline pumps are not great at drawing fuel, they really need to be close to the tank, at or below the lowest fuel level.

Any chance you could go to an in tank setup? What is the vehicle?

 

O great tips...wich regulator do i need if you can write a part number or picture would be grate..this is in a boat so i guess i cant put it in or under the tank

 

We have this pump on my buddies truck.
As long as you place it level with the bottom and to the rear of the tank outlet , it should work fine. This is assuming the tank feeds from the bottom.

I personally will only use aeromotive regulators. aeromotive 13204 will work great.

 

Thank you very much...I will try and see how it goes...yust one more question...what should be my hose thicknes...from tank to pump and from the pump to carb and back to tank..sorry for my writing

 

3/8 steel line for feed and return hasnt caused us any issue. I do have two 3/8 feed lines from the fuel cell that go to a Y just before the pump. The dual feed is just my concern with pump cavitation from not enough fuel gravity feed to the pump inlet. It may not be a problem. Just my precaution.

I would suggest a larger feed line from the tank to the pump.
If doing AN line, 8 feed and return with 1o feed to the pump.

 

Is this a mercruiser engine? Dont they make like 425ish hp n/a?

 

Great...yust to be shure i asked...ok i'll order the pump and regulator..

 

By the number on the block it is a chevy 502 2gen...piston is 45 inc bore #ad

 

You need to run a marine approved pump.

 

Thank you..yes i know..

 

I don't like inline pumps. Noisy, hot.

 

Cant hear this pump at all on his truck. Its also not daily driver quite when it comes to exhaust. But its not obnoxious. Id drive it everyday.

In blow thru applications pumps are much quieter. Must be a pressure thing.
Ive heard multiple efi cars with a1000 pumps. Of the a1000 blow thru setups ive done , they are drastically quieter than efi combos.

 

I used to run the gsl392's (Walbro 255) on my CJ, fed by carter low pressure electrics. You could definitely here the Walbros, even with the stupid loud side pipes. I am sure you will hear them on a marine application, but it's a constant tone so it goes away quick. You will notice it on startup then forget about it.

 

Guys thank you for your posts...Yust to say that noise is the last thing im woried about..When i drive my boat the engine is closed in a compartment bay and the only thing i can hear is american muscle screaming in the rear...Even my friends and i dont't talk to each other while driving because of the open exoust.