So have a Holley 80 gph on the clone, noticed a leak at one point, and after looking, discovered the roll pin the pump arm pivots on had backed out towards the block. So I pulled the pump, knocked it back in, and used a punch around the opening so it wouldn't back out again. It hasn't backed out, but not the darn thing is leaking from what appears to be the diaphragm (where it's pinched in the body of the pump).

What are decent mechanical fuel pumps that all are having success with? I would prefer one with NTP threaded input & output ports, and a min of 80gph.

I know the RobbMC ones are nice, any input there would be helpful, and any fitment issues with A/C as well.

Part numbers would be gratefully appreciated...

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he 40736 pump has a higher volume, not sure what it is, though. It also has a larger body.

 

Believe it or not the summit brand fuel pump I have has lasted me 6 years now with no issues. Just my experience.

 

I shopped it and can't find it. You have a part number for that?

Also found a TSP brand pump, but it's an 80gph free-flow, which is probably like half that when hooked up. Looks almost identical to the original Holley one, so again a little worried about that:

http://www.topstreetperformance.com/...-fuel-pump.php

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Yeah, I was hoping for NTP inlet & outlet fittings. More I look, seems only the RobbMC one has NTP fittings. Holley doesn't make the pump I currently have anymore, no surprise.

That's the airtex one right? If I were going to go that route, the carter m6109 would probably be my choice.

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I'm wondering why a minimum of 80 gallons an hour pump is ever needed, that's over one and a third gallon every 60 seconds! Are you running an engine that requires that much volume?

 

Most ratings are based on free flow, actual flow is usually a fraction of that. Also, if you choose to use a bypass return, like the OE pumps, then you need more. Not to mention the engine in question is setup for N20, and would like the option to run it in the future.

General rule of thumb is 3/8 line is good to roughly 400-450hp, slightly more if you have a higher volume pump. An OE pump is usually rated inline, at roughly 3 - 4.5 psi, and are typically in the 30 gph range. Free flow on that is closer to double, so 60+. Increase the psi and it can better overcome vapor lock, but impacts the volume. So there's an outline of the rationale.

I'm running a Holley, so would like to run in the 5.5 - 7.5 psi range. It's an A/C car, and it will sit in traffic.

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Quick search provided this info:

* Naturally aspirated engines are generally most efficient with a BSFC between .45 and .55 lbs/hp/hr.
* Nitrous combinations typically use a little extra fuel and often develop a BSFC from .5 to .6 lbs/hp/hr.
* Forced induction engines are often least efficient, and BSFC ranges from .6 to .75 lbs/hp/hr.


Using 500 hp as an example, we'll show the fuel requirement for two engine efficiency combinations:

(HP x BSFC = pounds of gasoline)
500 hp x .5 BSFC = 250 pounds of gasoline.
500 hp x .75 BSFC = 375 pounds of gasoline.


Since a gallon of fuel weighs about 6.2 pounds, we find that in our first example, 250 / 6.2 = 40 gph (gallons per hour) and 375 / 6.2 = 60 gph.


Read more: http://www.chevyhiperformance.com/te...#ixzz2XPsWcTl1

http://www.chevyhiperformance.com/te...m/viewall.html

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