Is there an E.T. cut off where say anything faster than a given time would signal that you should install an electric pusher type fuel pump in place of a traditional mechanical pump?

most roundy round cars are required to run a mechanical fuel pump...so there are some heafty pumps that support alot of hp...
they are rebuildable and tuneable.
cheapst

My old M.W. stocker went 11:20s ET at 3550 Lbs. at 119.+MPH with a mechanical pump only and a piece of crap stuck in the fuel tank pickup that I didn't know about until after I sold it. There was other M.W. stockers at the same race that went 124 MPH using the mechanical pump with a Holley blue as a pusher pump in the back My car ran faster with the mechanical pump only versus using the Holley as a pusher hook up to the mechanical The pumps we used back then where the Hemi Carter NASCAR race pumps, they have three diaphrams in them instead of the standard two diaphrams

I guess I will be ok with my Carter street/strip mech pump and 3/8 line up to 11.5 then.....right?

I've gone 11.33 @ 118.6 in a 3400# race wt Dart with a Carter strip pump with 5/16" line. It is suprising, but I run an Innovate o2 gauge and it reads between 12.8 and 13.0 a/f ratio through the traps.

10.5 @ 126 MPH here with a Clay Smith MP. I've seen a friend's dragster go 8.4's in the 1/4 on alcohol with one of these pumps. I'm real confident that low 10's/high 9's would be no problem. Jim

Back when my car ran 11.40s at 117 mph, I was running a Carter strip pump mechanical pump and the factory 3/8" line. I "upgraded" to -8 line, put a sump in the tank, and got a Holley blue pump. Did not change the performance at all.

I dont have any real input, but some have said they work

www.racepumps.com

put a fuel pressure gauge in it, and then you'll know. i have a carter strip mechanical pump, 3/8 line, in a high ten second street car. the pressure is 6.5 at launch, and 6.5 at the stripe. i get the feeling i'm not even close to needing more.

A customer I just build an engine for Has a 500" lowdeck, car weighs 3800lbs and the other week I went 6.80 @ 102 in it, and it has a stock fuel pump he would not change it even with me on him about it. Didn't miss or anything, actually kind of surprised me by far the fastest I have seen a stock pump go.

Had a stock carter mech pump on the 605" , was all done around 4000rpm motorway driving.

I ran 11.20's in a 69 Coronet with a $25 Napa fuel pump and stock 5/16 fuel line. I switched to a 1/2 hard aluminum line and a Holley blue and saw zero gains.

If you change your fuel line to 1/2" the stock & Hi-Perf mechanical pumps can't keep the fuel pressure up for very long without adding a pusher pump; the Carter or the Holley Blue are plenty adequate for that. For 5/16 or 3/8 fuel line, a good mechanical pump alone should be plenty.

NASCAR runs more than 800 hp with mechanical pumps.

i have a mech fuel pump i bought,its capable of any sb power,its made by racepumps,i never used it because its really not the best for street driven beast,,heat from the headers at stop lights can be a pain.ps i still have it in the box.

Thanks for all of the feedback everyone. Based on most are saying I should be fine but I guess it would be nice to have a gauge viewable from the cockpit to see what the pressure is at the stripe. I would need an electric gauge with a sending unit if I want to put it in the car.....right?

Sport440....I talked to ATI this week and they said my 8" vert is the tightest they make. I am going to put it in the car and make a few more passes with it in 2011 and see what happens.

A mech fuel pump is pretty simple... diaphragm, inlet,
outlet check valves and the pressure spring, then
the actuator arm... the diameter and stroke of the
diaphragm determine the volume... but the inlet and
outlet check valves are the restriction in the pump.
Some companies run 2 inlets and 2 outlet checks to
move more fuel with the big diaphragms... the pressure
spring on the back of the diaphragm will determine
the pressure based on the restriction of the needle
and seat.... I flowed a few thousand warranty pumps
for Chrysler in the fuel lab and tore many apart to
determine what the failures were

I found out the hard way that some electric tachs are not accurate, even high dollar race tachs Some of todays and some of the old race ignitions mess eletric tachs up above a certian RPM which may make your finish line RPM reading off so it looks like the converter is no good