Mechanical vs. electric fuel pump?

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well i went ahead and ordered the stock carter replacement pump....flows 120gph at a psi of 5.5-6.5....it should be enough for me right now, and then if i ever decide to run nitrous i can splice an electric in and use that for extra flow....thanks for all the replies guys!
 
mshred said:
well i went ahead and ordered the stock carter replacement pump....flows 120gph
Click to expand...


Not trying to be mean or anything but there no way that pump pushes that much fuel...it's a 20-30 GPH pump...the Carter super race/street pump with 6 valves only pumps 50-60 with that 1/4 pipe in/out.
The very biggest 6 valve with 3/8's pipe in/out with the huge body is a 90-120 depending on how large the valves are inside...
I've gone through the mechanical pump issue in the past and I'm speaking from experience.
 
Rob R said:
Not trying to be mean or anything but there no way that pump pushes that much fuel...it's a 20-30 GPH pump...the Carter super race/street pump with 6 valves only pumps 50-60 with that 1/4 pipe in/out.
The very biggest 6 valve with 3/8's pipe in/out with the huge body is a 90-120 depending on how large the valves are inside...
I've gone through the mechanical pump issue in the past and I'm speaking from experience.
Click to expand...

I am using this one on the 410......Carter Mechanical Huge 10an inlet and 8an outlet 172GPH.
No regulator required......will support nitrous without an extra fuel pump!!

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  • Fuel Pump, Mechanical, Competition Series, Mopar, Small Block, Each
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Brand
CarterManufacturer's Part Number
GM61147Part Type
Fuel Pumps, MechanicalProduct Line
Carter Competition Series Race Super Mechanical Fuel PumpsSummit Racing Part Number
CRT-M61147

Free Flow Rate
172 gphMaximum Pressure (psi)
7 to 8.5 psiInlet Attachment
Female threadsInlet Size
-10 ANInlet Quantity
SingleOutlet Attachment
Female threadsOutlet Size
-8 ANOutlet Quantity
SingleQuantity
Sold individually.Notes
Steel AN fittings included.
Big-time fuel flow for big-time performance.

Carter Competition Series Race Super mechanical fuel pumps deliver big-time fuel flow. Their free-flow output is 172 gph. Despite this high capacity, their compact size means that they often fit where other high performance pumps won't. In addition, they're "clockable," which allows the rotation of the inlet and outlet. They have heat-treated, high-speed levers, plus -10 AN inlets and -8 AN outlets, with fittings included. With 7 to 8.5 psi operating pressure, no regulator is required.
Warranty
 
Mad...

I'm pretty skeptical about those numbers that Carter claims...That small body and 172 gph@7.5 lbs seems really optimistic.
The big 6 valve Alcohol pumps have a body twice the size of those 4862 style carter pumps and they flow those kinda numbers that carter claims 172 gph.We just gave up using the 6 valve pumps and went with belt driven pumps.
When ever we got the volume/flow up to a TRUE 120 plus GPH a bypass or return line was needed.
It's been a long time since I've had to play with a mechanical pump but the amount of fuel that I got out of them with my test rig was no where close to the claimed numbers at the time.
The 120 gph out of a stock style carter pump as mentioned above just reinforced what I found out years ago...very very optimistic claims.
But hey...if it works for you that's all that matters
 
I'm running a Jegs electric pump, vein style which works great but it's noisy as hell.....wwwwwrrrrraaaaawwwwww,.........wwwrrrrraaahhhhhhhwwwwwww....wwwwrrrrrraaaaawwwww.......etc......

I have loud exhaust right now and I'm running straight resonators so I can't hear the pump as much as I will once I get my exhaust welded up.
At that point I was thinking of going with the black Holley gerotor style pump as they are supposed to be much more quiet, but I have not heard any feedback on those pumps as of yet.

If you do go electric make sure you run a relay to it otherwise you will eventually fry the switch and pop the fuse like I did.

I have also been told that it's a very smart idea to install an inertia fuel shut off switch in case you get in a wreck and can't shut the pump off.
I have heard some pretty nasty horror stories related to that.

I have yet to install one of those myself.
 
Rob R said:
Not trying to be mean or anything but there no way that pump pushes that much fuel...it's a 20-30 GPH pump...the Carter super race/street pump with 6 valves only pumps 50-60 with that 1/4 pipe in/out.
The very biggest 6 valve with 3/8's pipe in/out with the huge body is a 90-120 depending on how large the valves are inside...
I've gone through the mechanical pump issue in the past and I'm speaking from experience.
Click to expand...

hey man no offense taken! i thought it kinda didnt make sense...thats what was posted up on the summit racing website, and i kinda figured it was a typo or something...didnt make sense to me that the stock one flowed 120gph at a different psi from the strip super one lol...mind you 20-30gph is peanuts...is it really that low? now i feel almost as though that pump is DEFINATLY not going to be enough....anybody out there using the stock pump on a slightly hotter engine than stock?

Mad Dart said:
I am using this one on the 410......Carter Mechanical Huge 10an inlet and 8an outlet 172GPH.
No regulator required......will support nitrous without an extra fuel pump!!

large image Image is a representation of this part. Actual part may vary.

  • Fuel Pump, Mechanical, Competition Series, Mopar, Small Block, Each
  • sys_02_mini_info_blue.gif
  • Email this page
    function FindClick(){ var ctlX = document.getElementById('ctl00__CtlContentPlaceHolder_ctl00__CtlX') var ctlY = document.getElementById('ctl00__CtlContentPlaceHolder_ctl00__CtlY') ctlX.value = cX; ctlY.value = cY; } var addthis_config = { username: 'summitracingequipment', services_compact: 'digg, twitter, facebook, myspace, favorites, delicious, stumbleupon,reddit, more', services_exclude: 'print, email', ui_cobrand: 'Summit Racing' } var addthis_share = { templates: { twitter: 'check out {{url}} from @SummitRacing' } } Share
Brand
CarterManufacturer's Part Number
GM61147Part Type
Fuel Pumps, MechanicalProduct Line
Carter Competition Series Race Super Mechanical Fuel PumpsSummit Racing Part Number
CRT-M61147

Free Flow Rate
172 gphMaximum Pressure (psi)
7 to 8.5 psiInlet Attachment
Female threadsInlet Size
-10 ANInlet Quantity
SingleOutlet Attachment
Female threadsOutlet Size
-8 ANOutlet Quantity
SingleQuantity
Sold individually.Notes
Steel AN fittings included.
Big-time fuel flow for big-time performance.

Carter Competition Series Race Super mechanical fuel pumps deliver big-time fuel flow. Their free-flow output is 172 gph. Despite this high capacity, their compact size means that they often fit where other high performance pumps won't. In addition, they're "clockable," which allows the rotation of the inlet and outlet. They have heat-treated, high-speed levers, plus -10 AN inlets and -8 AN outlets, with fittings included. With 7 to 8.5 psi operating pressure, no regulator is required.
Warranty
Click to expand...

Hey Mad,
i just tried finding that part number on summit and its not listed anymore..i guess they dont make em for the chryslers no more?:munky2: that does look like a pretty sweet pump and would be great to buy and have for when i do my nitrous later on....mind you, it seems that 8.5psi would warrant the use of a regulator even though they say its not nescessary
 
I always wondered about their ratings too. I bought the M6270 and when I took it out of the box I found it has only 1/4" pipe in and out. Plus there was a big burr right at the input that blocked about 1/3 of the inlet. I de-burred it so there was no restriction. Also drilled out the i.d. of the fittings as big as I felt I could and them be strong enough not to break. Does it flow 120 gph. I doubt it. But it does what I need it to do. Doesn't go lean on the top end.

I see Holley and Edelbrock both have pumps that look alot like the Carter but are rated at 110 gph. The Eddy has 3/8 pipe fittings so at least there isn't as much restriction there.
 
just incase any one is intrested,,,there are now 2 mechanical pumps for the smal block mopar with big flow ratings,,,one is an edelbrock big pump,,no in fo on there web site and they dont return e mails,,i found all the info on summits web site,,but that pump isnt cheap,,its over 350.00 bucks,,,but its there if you perfer it to electric,,,

also another mechanical pump for smal block mopar,,has a rating of 450 GPH,,,and built to last 240,000 miles,,so they say,,,out put pressure is adjustable,,,and suports 250 to 2500 horse power,,,and it -AN fitted,,,and guess what its not cheap either over 400 bucks if i remember correctly,,, info on this big A** pump can be found at racepumps.com

one thing to keep in mind,,the average electric pump is not dependable and will burn up sooner or later,,,when you out miles away with no parts money or tow truck,,,they run hot thats what kills them,,,the only average electric pump ive seen run for any length of time is the standard carter/stewart warner pump goldish can mounting studs out of the top,,,the more expensive electric pumps,, AERO,, are said to have fuel around the motor windings keeping it cool fro longjevity,,,like a modern day fuel injected auto the pumps are in the tank,,,,to keep them COOL,,,unless you have some kiler street motor,,the carter mechanical pump is the way to go,,,if it puts out more then 6 PSI you should use a pressure regulator,,holley carbs tent to blow the needle and seat with more then 6 PSI constantly,,,or the ytent to drip more fuel then you need,,,,
i run a carter street strip on my blower motor 2 holey carbs flowing 862 CFM each,,and its fine untill i put it too the floor,,,then i need the one in the back,, to help out,,,
 
Rob R said:
Mad...

I'm pretty skeptical about those numbers that Carter claims...That small body and 172 gph@7.5 lbs seems really optimistic.
The big 6 valve Alcohol pumps have a body twice the size of those 4862 style carter pumps and they flow those kinda numbers that carter claims 172 gph.We just gave up using the 6 valve pumps and went with belt driven pumps.
When ever we got the volume/flow up to a TRUE 120 plus GPH a bypass or return line was needed.
It's been a long time since I've had to play with a mechanical pump but the amount of fuel that I got out of them with my test rig was no where close to the claimed numbers at the time.
The 120 gph out of a stock style carter pump as mentioned above just reinforced what I found out years ago...very very optimistic claims.
But hey...if it works for you that's all that matters
Click to expand...


This pump is in no way small like the stock bodied pump. It barely fits and I had to Grind my block away about 3/8's of an inch for it to clear. For what I am doing it should be fine. Carter says it will feed a 800 hp engine, I dont know about that though........should be good enough for what I am doing.
 
mshred said:
hey man no offense taken! i thought it kinda didnt make sense...thats what was posted up on the summit racing website, and i kinda figured it was a typo or something...didnt make sense to me that the stock one flowed 120gph at a different psi from the strip super one lol...mind you 20-30gph is peanuts...is it really that low? now i feel almost as though that pump is DEFINATLY not going to be enough....anybody out there using the stock pump on a slightly hotter engine than stock?



Hey Mad,
i just tried finding that part number on summit and its not listed anymore..i guess they dont make em for the chryslers no more?:munky2: that does look like a pretty sweet pump and would be great to buy and have for when i do my nitrous later on....mind you, it seems that 8.5psi would warrant the use of a regulator even though they say its not nescessary
Click to expand...


Call them or do a google search with that part number, you will find it somewhere for sure!
 
fishy68 said:
I always wondered about their ratings too. I bought the M6270 and when I took it out of the box I found it has only 1/4" pipe in and out. Plus there was a big burr right at the input that blocked about 1/3 of the inlet. I de-burred it so there was no restriction. Also drilled out the i.d. of the fittings as big as I felt I could and them be strong enough not to break. Does it flow 120 gph. I doubt it. But it does what I need it to do. Doesn't go lean on the top end.

I see Holley and Edelbrock both have pumps that look alot like the Carter but are rated at 110 gph. The Eddy has 3/8 pipe fittings so at least there isn't as much restriction there.
Click to expand...

I did the same thing with the fittings on my pump, drilled them out to the max.
 
If your making any kind of real power 500 h.p. or more i wouldn't trust a mechanical pump,may not flow enough and lean the engine out or fail and dump raw fuel in right into your oil..i run a Holley black pump and the last thing i worry about is fuel starvation.. too much money in my motors to take a chance with mechanical pumps..
 
fstfish you make a good point about the electrics burning out....i plan on driving my car on long trips and i dont want the problem of a burnt out pump...atleast with a mechanical if it craps out you can go to the nearest parts store and pick up a replacement and your in business....those race pump brand pumps are nice, but they are pricy, require their pricey regulator and i have heard some not so good stuff about them...maddart, that pump is something i think i will definatly look into...the stock pump i ordered already came in, so im going to run it...if i start to have starvation issues then ill go on from there...it really seems though that there is a uniform split between those who support mechanical pumps and those support the electric
 
Here is the picture after I ground down the nipple you see on the block to clear the pump. I took it down around 3/8's of an inch.


410 stroker motor 001.jpg

410 stroker motor 002 - Copy.jpg

410 stroker motor 001.jpg


410 stroker motor 002 - Copy.jpg
 
just curious,,whats the pressure on this pump ??? you say it flows 172 GPH ?? got a part number ??? ide like to look it up,,,looks lime my carter,,,but didnt have to grind any thing,,,my pump claims 120 GPH, thanks in advance,
 
fstfish66 said:
just curious,,whats the pressure on this pump ??? you say it flows 172 GPH ?? got a part number ??? ide like to look it up,,,looks lime my carter,,,but didnt have to grind any thing,,,my pump claims 120 GPH, thanks in advance,
Click to expand...

Part Box picture is in post 40...............Pressure is 7 to 8.5 lbs.

My last stock pump on the fuel pressure gauge was at around 9lbs. I run a demon with Bottom feeder CARP style needle and seats. Had no issues.
 
All good advise. How much fuel did you have in your tanks at launch. Mine runs out @ 1l2 tank (stock tank) when you can see the trap. If you add nos like I did you'll want either a dedicated electric or a large elect with a fuel log and regulators. Don't forget the fuel pressure kick out switch it'll save your engine.
 
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