fuel tank issues

[nascarmikeb]

This thread may be posted on this site, but I can't locate it. I have an '87 GMC SWB. Of course it has dual tanks w/ electric fuel pumps. I am put in a carbureted engine, w/ mechanical fuel pump. Should I remove the electric pump? If so, what different parts, if any will I need where the pickup line goes into the tank?

Or, will the mechanical pump pull the fuel through the old electric pump?

Mike

[RodsGreen10]

Originally Posted by nascarmikeb

This thread may be posted on this site, but I can't locate it. I have an '87 GMC SWB. Of course it has dual tanks w/ electric fuel pumps. I am put in a carbureted engine, w/ mechanical fuel pump. Should I remove the electric pump? If so, what different parts, if any will I need where the pickup line goes into the tank?

Or, will the mechanical pump pull the fuel through the old electric pump?

Mike

Why are you going mechanical pump? Why remove the intank pump when you can use the Intank fuel pump for a carb. Just need Some fittings and a bypass regulator.

[nascarmikeb]

Thanks for the reply..
I don't have to remove the pump, just figured I needed to.
Can you point me in the direction of the parts that I will need? I will search for a bypass regulator online, but if there are some specific one that work well, I'm open to suggestions.
Mike

[nascarmikeb]

This looks like what I need
I'm running a holley 650

[RodsGreen10]

Originally Posted by nascarmikeb

This looks like what I need
I'm running a holley 650

As long as it is a bypass regulator. Yes. The return line needs to be as big as the feed line. Example -8 an feed -8 an return. But for that carb size -6 an will be fine.

[RodsGreen10]

Do you use both tanks or just 1?

[65standard]

I'm sure you could just eliminate the in tank pump with a piece of hose. Then run the mechanical pump if you want.

[nascarmikeb]

wow those pics make it look like a nice clean job
Ill start pricing it. So what are the advantages of using this type setup vs. old school mechanical?

[RodsGreen10]

The advantages of the bypass style regulator

- Return style provides constant effective fuel pressure to the outlet port – pressure overage is bled off through the return port as needed.
- Constant effective fuel pressure enables fuel pressure to be set more accurately, and should remain constant regardless of load. It should be noted that the engine is not required to operate to accurately adjust fuel pressure, however, the fuel pump does need to be energized.
- Longer pump life and quieter pump operation as the pump is operating just hard enough to maintain pressure, instead of maintaining a higher as is the case of blocking style regulators.