Hello respected Sofa, Fbird, fast355, skinny Z, Tom 400 et al,

Still have my ‘88 IROC. but swapped a Vortec in my new-to-me ‘87 Monte SS whose 305 has “ceased to be”.

Would prefer not to have to use a FPR.

Does the following sound feasible?

1)Use a new factory ‘87 Monte Carlo V6 TBI in-tank pump & sending unit assembly.

2)Replace the 13 lb TBI pump with a Vega 6 psi 35gph factory in tank pump 3) Use a proper pump relay with the relay coil powered by ignition-on with an oil press safety switch.

Wasn’t sure if this should be in engine swap, tech, or carbs. Thank you gurus.

 

Not sure about "guru", only, mathematician...

A stock L98 has 8 22 lb/hr injectors; so, 176 lb/hr of consumption at 230ish HP.

Gasoline weighs about 6Ľ lb/gal depending on how much ethanol it has in it (which also increases the demand). Therefore 35 gph is just under 220 lb/hr.

So yeah, it'll "work", barely, at the stock L98 level, if all else is perfect. BARELY. Won't supply much past 260 HP worth of fuel no matter what.

For, say, 350 HP, you'll need somewhere more around 43 gph, ABSOLUTE BARE MINIMUM. Meaning, there's still a chance it's gonna lean out HARD at the big end. I think I'd want more like at least 50 gph (300 & small change lb/hr) GUARANTEED at 6psi to stay out of that kind of problem.

I'm thinking it's not a good plan.

 

Thank you Sofa,
Through the years, you seem more like a scientist than just a mathematician. Fortunately for me as an old Third Gen fan boy, you deign to lower yourself to the TGO ****** tech section lol.

This ‘87 Monte SS will be just an around town “driver“.
I neglected to mention that it will be a non-computer Quadrajet on a standard performer Vortec intake, with a non-computer HEI.

So, use a slightly higher pressure 13 pound V6 TBI in-tank pump and then use a up front FPR would be the way to go?

 

I think I'd use a V8 pump, and a FPR w fuel return (in/out/return/gauge ports), up by the engine.

Well, thanks. I'm also nominally a physicist, although physics & math wasn't a marketable skill set when I was starting my career (just after they invented math), so I've made a living, such as it is, as an engineer of one sort or another all this time, mostly electrical and electronic.

The sciences, and engineering (and medicine for that matter), are all inter-related, butt are NOT the same thing. That kind of knowledge is like a stack, where each branch is built on top of the more basic ones below it. It's easier to move up the stack if you have knowledge of the lower layers, than it is to move down it, i.e. start from a higher layer and drill down toward the basics. Most branches don't need a particularly complete knowledge of the layers below, only wide and deep enough familiarity to underpin whatever layer someone chooses to specialize in.

Math is the universal language for all of them. It's at the very bottom of the stack. At its core, it's a language, a systematic way of expressing ideas, at least as much as it is a "knowledge" of its own. Anything that involves numbers, even business or accounting or finance for example, needs math. In the sciences, the next layer on top of math is physics, which is quite simply the study of the physical world (heat, electricity, light, motion, subatomic particles, etc.), and is a science. Much of math, maybe even most of it, has been invented, as ways of organizing knowledge about physics. "Science" is a specific method of searching for pure knowledge and distinguishing between truth and falsehood. Science is NOT a fixed and settled body of knowledge to be memorized and never challenged, like non-scientists often mistakenly accuse it of being, as opposed to what engineering or medicine are, which are ways of usefully applying knowledge already obtained, to problems and needs of real people in the real world. Chemistry is on top of physics. Many forms of engineering (applied knowledge) only need the "stack" up to physics; electrical in particular, which is what I've mostly done, butt also mechanical. Obviously chemical engineering requires chemistry. Biology is on top of chemistry, anatomy and medicine are on top of that as well as all manner of things like agricultural stuff. Medicine really is 2 very different disciplines. One, there's the science part of it, which is pure research that yields knowledge. Then there's the part about actually healing people, which is more an application of that knowledge, like engineering in a sense. Again, you have to have knowledge in order to apply it, butt doesn't have to be as thorough as a knowledge specialist.

Oh well. Someday I'll get a marketable skill maybe.

 

Sofa,
This “Stack” of yours with all the branches and layers was explanation so clear & descriptive I reread it a couple of times just to enjoy the explanation.
Thanks for the unexpected insight.
As Johnny Carson used to say “I did not know that!”

I’ll have to just get a proper V-8 FP and use my Mallory 4309 that’s been sitting on on an shelf and use a proper return.
Thank you