[whaleyracing]

i have a carter m6907 that not getting it done anybody else with one having trouble what kind wood be a good one to get thanks

[steve25]

What carb does the pump have to feed, and what size motor and it's HP?

[ponyakr]

http://www.robbmcperformance.com/pro...ontiac550.html

http://www.robbmcperformance.com/pro...ntiac1100.html

[66bonne]

^^^^^ The best and the best customer service. Have been running the 1100 unit and NEVER have had a fuel supply issue.

Jim

[whaleyracing]

cliff q jet had a new quick fuel 750 on it get up to about 4 grand it likes it runs out of gas 400 im going to say 300 hp

[1969GTO]

Originally Posted by ponyakr

http://www.robbmcperformance.com/pro...ontiac550.html

http://www.robbmcperformance.com/pro...ntiac1100.html

x2 for me

[TCSGTO]

No matter what mechanical pump you decide on the feed line from the tank to pump should be larger than stock. My RobbMc 1100 started acting up this year. I got it when he first started making them so it was in use for quite a few years.

I sent it back and the rubber parts were deteriorated so Rob gave me the option of repairing it for a minimal cost or replacing it with the new billet style at a nice discount. That's great customer service.

I've never had a fuel delivery problem with his pumps,they flat out work.

[AG]

I've run 12.40 with a Carter mechanical using the stock fuel line a a '65.

[Formulajones]

Originally Posted by whaleyracing

cliff q jet had a new quick fuel 750 on it get up to about 4 grand it likes it runs out of gas 400 im going to say 300 hp

Have you verified this with a fuel pressure gauge?

With your engine size and reported HP there is no reason a stock pump wouldn't feed that. Especially with a holley and dual float bowl capacity. Easier to suck a Q-jet dry with their limited float bowl capacity but at your power level it shouldn't be an issue.

I've run a 434 for years with a Q-jet, stock pump, stock lines, and fuel pressure is rock solid.

[whaleyracing]

put a gauge on it went from 51/2 to 2 pounds when you get in it

[Formulajones]

Wow, a stockish 400 with an estimated 300 HP doesn't have all that much fuel demand. I'd probably check some other things like a partially clogged fuel sock in the tank, a collapsing rubber line, I've even seen the rubber lines turn to goo inside, they aren't collapsing but seriously restricting flow, restrictive fuel filter etc....Or maybe a faulty new pump or worn accentric...

Something odd happening for a stock pump not able to feed a stock 400. No need for a killer fuel system on an engine making that kind of power.

[tpssonic]

I'm running a Carter m6907 with a 462stroker, OF cam and headers, 300+ cfm E-heads, RPM intake with E 1413 carb. I go from 6.5 psi at the beginning of the run to about 4 psi at the end of about a 1/4 mi. I have the original 3/8" line with the stock pickup. I checked this ONCE and only on a back road- NOT at the track. Your results may vary.

Tony

[Skip Fix]

I'll disagree a stockish motor can have fuel issues. My 78's 180 HP 400 we freshened in 82 and just added a 228/228 @ 0.050 cam, stil stock manifolds true dual-ran out of gas with teh Q jet until I added a small pusher AC Delco electric after every mechanical out there at the time -Holley, Carter new AC Delco.

[78w72]

heres my experience with mech pumps. had a 78 t/a with stock fuel lines & a mild 455 with 6x heads, comp magnum cam with .480 lift. car ran very good back in the early to mid 90's, probably a high to mid 12 sec car... never had a fuel problem with a stock type large canister replacement pump from auto zone. raced that car every day & night on the street & ran to 5500-6000. no fuel related issues. but a drag strip is a big difference from the street.

today have a 78 t/a w72 4 speed with a mild build 400, comp xe 268 cam & cliff q-jet on stock intake, little less power than the old 455 t/a, but again no fuel issues with stock lines & pump. 1/4 mile did mid 13's (soft launch with the 4-speed) but 104mph, should be low 13's or high to mid 12's.

also just finished a 72 bird with a ~520hp dynoed 467 stroker. stock 72cc e-heads, OF roller cam, SD ported cast iron intake & cliff q-jet. that car has robbmc 1/2 pickup, 1/2 hard line from tank to front subframe, -8an line from there to pump & pump to carb. using the edelbrock rpm mech pump & so far no known issues at the track or on the street. bfg drag radials that wouldnt hook so times sucked but mph was 118+, should be goood for mid 11's if i can get traction. the pump is rated to "600hp" according to edelbrock but they said the pickup & lines need to be up to par for that rating. no fuel gauge to verify pressure but no signs of starvation on the track running hard to 5500+.

so i agree, a stock 400 should have no problem on a stock mech pump, if it does, there is likely another issue causing it. as mentioned above check the things you can & see if you can find the problem, if not might be worth a new pump from robbmc or the edelbrock is nice too, but no return lines on it.

[Formulajones]

Originally Posted by Skip Fix

I'll disagree a stockish motor can have fuel issues. My 78's 180 HP 400 we freshened in 82 and just added a 228/228 @ 0.050 cam, stil stock manifolds true dual-ran out of gas with teh Q jet until I added a small pusher AC Delco electric after every mechanical out there at the time -Holley, Carter new AC Delco.

My very mild 434 with a small cam dyno'd at 385 flywheel, and 301/355 at the rear wheels, running the stock Q-jet, manifold etc.. and a stock large capacity ACdelco fuel pump, stock 3/8 lines with the original 1/4" return line. Probably 60-70 drag strip passes (likely more) over the last 16 years along with at least 30k street miles, still using the same pump I put on 16 years ago. It's never once run out of fuel even at the dragstrip, and holds a very nice flat 13:1 AFR.

Not sure why some of you guys with very stock or even mild 400's can't do it while others do it even with larger engines "shrug" That's why it leads me to believe there is an underlying problem some have just not figured out yet.

Have other types of engines here as well with stock pumps and fuel line systems that feed well over 400hp in some engines as large as 454's that work fine, as well as building a few customer engines/cars this way, and prefer to build them all with a return line setup. It's only when I've gotten up into the 500+ HP realm where I've seen a real need for a big pump/big line system.

[Tom Vaught]

Swapping out gas lines for a larger size, (unless you are doing a restoration/upgrade on the vehicle frame is a pain. I installed two new 3/8" lines on my convertible).

A simple pusher type pump feeding the stock pump works very well. Usually you need a small fuel pressure regulator to control the fuel pressure as one pump feeding a second pump multiplies the pressure. The flow goes up but not like the pressure.

A simple check valve and a NOS switch allows you to turn the pusher pump on when you want to go fast. Otherwise the pusher pump is off and the mechanical fuel draws fuel thru the checkvalve in a normal manner.

Lots of ways to fix the running out of fuel issue without expensive parts.

Tom V

ps I needed a new gas tank for my 64 GTO convertible so this next go around I am going to purchase a Tanks, Inc 64 GTO "EFI" tank that has the fuel pump in the tank, (cooled by the fuel) and is built with a "factory design" baffle system to keep fuel from running away from the fuel pump on acceleration. A normal efi style fuel pressure regulator will work with the system and return fuel down the second fuel line installed on the car back to the tank. Modern Fuel System Technology.

[78w72]

Originally Posted by Tom Vaught

Swapping out gas lines for a larger size, (unless you are doing a restoration/upgrade on the vehicle frame is a pain. I installed two new 3/8" lines on my convertible).

good point... but only applies to a full frame car. uni body cars are an easy change of lines. not sure what car the OP has, but just wanted to mention that.

[Formulajones]

Actually, you don't have to look too hard to find more success with the stock fuel delivery setup than the pure stock drags. You aren't allowed bigger pumps, bigger lines, no pusher pumps allowed. Alot of these cars are tuned and tweaked on the edge and running pretty strong. Alot of these cars are dipping into the 12's, and even a few in the 11's. Quite a few Pontiac examples in that mix.

[Tom Vaught]

Originally Posted by 78w72

good point... but only applies to a full frame car. uni body cars are an easy change of lines. not sure what car the OP has, but just wanted to mention that.

Only owned one F-Body (a 78 Trans Am) and never messed with it so appreciate your knowledge on those cars.

Tom V.

[68azbird]

X2
Take the 40+ year old dirty sock off the pick up and replace all the 40+ year old rubber hose.