Im about to install an LT1 into my '70 and in the process i will be relocating the gas tank. Due to budget constraints I am leaning towards the blazer tank conversion and an inline external fuel pump mounted on the frame. Should this be a problem? Has anyone done this or know what pump I should use?

I suppose my other option is getting a '95 s10 blazer tank with the internal pump but will that pump handle the LT1s needs and if I DO need to replace it which one should I get?:confused:

big thx guys and gals!

well i would think the lt1 requires more fuel pressure than a vortec 4.3, the only lt1 swap i did i changed it to a carb and intake, it also eliminated that optispark crap that everyone hates although i think msd is making something for it now, the lt1 engines make more hp and tq with the carb and intake setup too

I have posted this advice before, so I know there are others with a different opinion, but I would not do a frame mounted pump. Been there, done that, never again.

Do yourself a favor and get the pump in the tank. You'll save all the hassles of vapor lock, burned up pumps, and lean high rpm condition. I had all of those problems until I put it in the tank.

I have a Blazer with a steel aftermarket tank. If that's what you're considering, it's not too hard to cut a hole in the tank, make a flange to cover it and put any pump you need on a stick welded to the flange.

I have no idea if the S10 tank you mention would have an adequate pump, but I would be very suspicious about that if that is the way you're leaning.

Also, this is easier with a Blazer where there is carpet or the like covering the area, but, even if I had a pickup, I would cut a hole in the bed above the fuel pump access so that the pump can be changed without dropping the tank. I did it on my Blazer (covered with a flange made from the bed of another truck), and it's the only way to go IMHO.

Obviously, anything that involves metal work on a tank that has had fuel in it is extremely hazardous without the proper precautions, so if you're not a pro in that area, consult one (or a few) before you do anything like that.

I can't remember the numbers, but I am pretty sure the fuel pump in a 91 - 93 W code Vortec S- truck will give you more than enough fuel... I think it was 45 - 50 PSI... It's been a few years now, but i am almost positive that's what it put out.
I agree with intank pumps. yeah, they suck, but they suck less than an inline pump, and if this is a daily driver, i wouldn't even consider an inline pump.

I... I think it was 45 - 50 PSI...and if this is a daily driver, i wouldn't even consider an inline pump.

Thats what I needed to hear. Thanks for the info guys!

Check out www.tanksinc.com They make a great in tank pump with sump incorporated into it. I used it for my TPI swap into the Blazer and have never had a problem.