internal or external pump?

Reply Subscribe

Thread Tools

Search this Thread

Nov 1, 2016 | 02:42 PM

jimmyp3353

Thread Starter

Launching!

iTrader: (3)

Joined: Aug 2009

Posts: 262

Likes: 1

internal or external pump?

I have a 98 Z28 that a carb'd LM7 is going into. I'm using the stock tank. Would it be better to run an external pump or an in tank pump? If in tank, do I use the regulator in the tank, or ditch it somehow. If external, how would I plumb it using the stock tank. Isn't much movement in the carb section.

Nov 4, 2016 | 09:25 PM

gametech

TECH Veteran

iTrader: (1)

Joined: Sep 2004

Posts: 4,905

Likes: 906

From: Stockbridge GA

Quote:

Originally Posted by jimmyp3353

An internal pump is almost always better, except when you can't get one big enough to supply your needs. I doubt this is the case at this point. If you use the in-tank regulator, you would still have to run an additional external bypass regulator to get the pressure down to carb friendly levels. Now that I think about it, didn't '98 still use a return style with a rail-mounted regulator? If that is the case, you just run a low pressure regulator to feed back into the factory return line, and the only plumbing you have to change is under the hood. As a bonus, the factory pump will flow quite a bit more at 8 or 10 psi than it does at 58.

Nov 7, 2016 | 09:21 AM