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?

[RodsGreen10]

http://m.summitracing.com/parts/rus-644123

http://m.summitracing.com/parts/rus-644113

The above goes on the hardline coming off of pump sender.

[RodsGreen10]

http://m.summitracing.com/parts/sum-220107b

Use this if using both tanks.
This is uncharted waters for me on this y cause I don't have the dual tanks. But with this run both feed line into it and one up to the fuel log.

[RodsGreen10]

you also will need new fuel line. What I used on mine was black braided fuel line. I used -8an but my motor isn't stock by any means. For what you have do -6an.

[RodsGreen10]

And a new inline fuel filter.

[RodsGreen10]

Example of tank with quick connect and some 45 an fittings

[RodsGreen10]

And a close up. Now the hardline fittings I post above I ended up using them on my setup. The ones I posted above and that is what I have now are better than what is in the pic below.

[nascarmikeb]

Got it that is great info
Ill start planning it now.
Only my driver side is functioning, I'd love to get both tanks going.

[RodsGreen10]

Originally Posted by nascarmikeb

Got it that is great info
Ill start planning it now.
Only my driver side is functioning, I'd love to get both tanks going.

Even better for me giving advice lol. Scratch the Y then.

[RodsGreen10]

Get those fittings fuel line fuel filter and a fuel log.

[RodsGreen10]

You want to mount the bypass regulator up as close and level to the carb as you can.

[RodsGreen10]

I bootlegged this off of the Internet. But this is ideal for mounting cause this isn't a bypass reg.

[RodsGreen10]

Another example. This is not a bypass regulator but example of mounting.

[RodsGreen10]

This is what I have ordered for my carb to EFI now back to carb again after EFI BS. I run fuel logs so IMO this is the best of the best setup for a bypass carb system with intank pump.

[RodsGreen10]

But no matter what you get or do the key is the bypass regulator and having the return line the same size as the feed line. If you do t have the return line the same size as the feed line you get a pressure drop.

[RodsGreen10]

It looks like a lot of stuff but it's just plug and play really. And some money lol.

[RodsGreen10]

Idk know your budget or how deep you want to get into it. But it is going to cost more that going mechanical pump. But it's a better system with in tank pump and bypass reg IMO.

[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.