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Limits on mech. fuel pumps?????? #2061514
04/25/16 05:29 PM
04/25/16 05:29 PM
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Porter67 Offline OP
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Im trying to dumb down one of my rides, its a mild 434 with 2 4s and max 6500 rpm.

I have a 3/8 line to and into the tank.

Could one of these pumps support the setup?

And where in the heck do you find rebuild kits for these.

They look the same, but ones a holley and one a carter and ive had these a long time.

I have dual widebands but if there is no chance this combo will work I wont attempt it.

What are the FAST guys using?

THANKS!

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Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061522
04/25/16 05:44 PM
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I would go with 1/2" on the suction side, 3/8" for the pressure. Tim


1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!
Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061524
04/25/16 05:45 PM
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Porter67 Offline OP
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I can do that....

Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061594
04/25/16 07:37 PM
04/25/16 07:37 PM
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fast68plymouth Offline
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The "faster" FAST cars run electric pumps routed through gutted mech pumps for the correct look.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061604
04/25/16 07:55 PM
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ademon Offline
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I'm sure those pumps will be fine, they worked back in the day on hot hemis, 440's, 454's.

Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061609
04/25/16 07:58 PM
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Porter67 Offline OP
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Ok, thanks fellas. I had these on a stock 340 and wasnt sure how much they could do.

I thought maybe the fast cars did it that way.

Anyone got a source for to get the rubber parts to rebuild?

Re: Limits on mech. fuel pumps?????? [Re: fast68plymouth] #2061612
04/25/16 08:01 PM
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Originally Posted By fast68plymouth
The "faster" FAST cars run electric pumps routed through gutted mech pumps for the correct look.



If that`s the case then a GOOD elec. would be my choice for several reasons...........


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061664
04/25/16 09:42 PM
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I used to like to run mechanical pumps when they fit the application.
However, today's fuels seem to get into vapor lock type situations easier than in the past.

I'm not a chemist, but (I did stay at a holiday inn express last night) I thought I read that there used to be additives blended into the gas to help prevent the onset of vapor lock by raising the boiling point when under vacuum.
Basically, all newer vehicles have the fuel pump in the tank, so the entire system is constantly under pressure, so the additives used to help with the vapor lock are no longer needed, or used.

Over the last couple of years I've had several customers contact me about vapor lock issues with cars still running mechanical pumps.
Never a call like that from anyone running a properly thought out electric pump/system.

There are so many options for electric pumps now, you should always be able to find something that's a good fit for the application.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Limits on mech. fuel pumps?????? [Re: fast68plymouth] #2061672
04/25/16 09:54 PM
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GY3 Offline
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I use the Carter pump pictured. Not sure you can still get parts as it is only available through Mancini Racing now.

I feed an 11.30 @ 119mph car with a 505" stroker with it and nothing more. It seems to never nose over even on pulls longer than 1/4 mile.

I use a couple of things to keep vapor lock under control: I have a 1" phenolic spacer under an 850 Demon. I also run pump 91 gas but only the No Ethanol!

So far I haven't used it in the heat of summer with this exact combo but it has been fine with a milder 440. The spacer helped out a ton!

Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061674
04/25/16 09:58 PM
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Porter67 Offline OP
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C12 or C16 if im spraying, I have a hidden ele pump on a older under manifold kit. Hidden bottle, ect...


So fuel is not a issue.

We get just a few brief moments to look over each others cars.

But where can I get the rubber parts to rebuild?

Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061686
04/25/16 10:13 PM
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Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061694
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Porter67 Offline OP
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Thank you sir...

Re: Limits on mech. fuel pumps?????? [Re: fast68plymouth] #2061699
04/25/16 10:31 PM
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Originally Posted By fast68plymouth
The "faster" FAST cars run electric pumps routed through gutted mech pumps for the correct look.



i always wondered about this idea i've had, if it would work. have a gutted mechanical pump, thats actual a regulator. you could run all metal lines with regular fittings, even have a return line...


526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061702
04/25/16 10:34 PM
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Porter67 Offline OP
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From my tractor pulling days im pretty good at hiding things... I had a 10 lb nitrous tank in a dummy area of my al fabbed water cooling tank. Took the ntpa 2 years to find it.

I know the ele pumps come real small these days.

Maybe we need a PN from the fast guys?

Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061710
04/25/16 10:50 PM
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rickstershemi Offline
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my 408 475HP Tunnel Ram 2-500avs carbs never had a problem with that same type mech pump and stock 1/4" fuel line.

Re: Limits on mech. fuel pumps?????? [Re: rickstershemi] #2061767
04/26/16 12:13 AM
04/26/16 12:13 AM
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Mech pumps can work ok but with todays pump gas to me if you run a pump gas street car I would go with an electric pump which I do. Course we still have the problem of this pump fuel boiling in the carb bows if your underhood temps get hot enough as I have seen a car running about 190 in 95 degree weather at Carlisle and the fuel was boiling in the Demon carb bowls while we sat idling in traffic because the fuel in the bowls was hotter then the 190 the eng was. We had to put a Phenolic spacer on the car to fix it. But as was said fuel under pressure wont vapor lock as easy as fuel under vacum being pulled to the pump mounted on the eng. No question for my street car as I run an electric pump. Ron

Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061955
04/26/16 12:29 PM
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Originally Posted By Porter67

Maybe we need a PN from the fast guys?


The trunk area is not an inspected area in FAST. You can run any fuel pump you want, even a fuel cell. Some of the guys hide a small cell with a pump inside the OE gas tank, but that's just their preference, it doesn't need to be hidden. You just aren't supposed to have any fuel system "upgrades" visible under the hood.
The engine bay has to have the correct sized lines and routing, etc.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2061990
04/26/16 01:32 PM
04/26/16 01:32 PM
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RMCHRGR Offline
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If you don't go to some hidden type of delivery system, you might want to look into a Clay Smith mechanical fuel pump which flow a lot of fuel and come with 1/2" ports. Main drawback is that they are a bit of a pain with their clearance issues since the pump body is larger than any Carter. On my small block, I had to modify the water pump inlet to clear the pump. Other than that, it installs like normal. They require a regulator.

Click here.

The CS pumps are (generally) cheaper than most any new electric pump. I used one on my new 416, didn't want to deal with wiring the pump, noise etc. The in-tank electric pumps just seem really expensive for what they are.


'68 Coronet
'71 Duster
'17 Ram 1500
Re: Limits on mech. fuel pumps?????? [Re: RMCHRGR] #2062008
04/26/16 02:10 PM
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Originally Posted By RMCHRGR
If you don't go to some hidden type of delivery system, you might want to look into a Clay Smith mechanical fuel pump which flow a lot of fuel and come with 1/2" ports. Main drawback is that they are a bit of a pain with their clearance issues since the pump body is larger than any Carter. On my small block, I had to modify the water pump inlet to clear the pump. Other than that, it installs like normal. They require a regulator.

Click here.

The CS pumps are (generally) cheaper than most any new electric pump. I used one on my new 416, didn't want to deal with wiring the pump, noise etc. The in-tank electric pumps just seem really expensive for what they are.



The Clay Smith pump is currently unavailable.

Re: Limits on mech. fuel pumps?????? [Re: Porter67] #2062068
04/26/16 03:52 PM
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To the OP...


The older Carter pumps are slightly different than the newer ones. Mancini only has the kits for the newer style.

There is a place called THEN & NOW AUTOMOTIVE in Weymouth MA. They have parts for all th Carter pumps. Carter don't even have time. They don't have a web site so you have to call them. I just rebuilt my pump, it was easy and cheaper than new. Plus, if you look at the housing close, you can see how to improve flow a bit.

The phone number is 781-335-1925. Call them that can fix up up. Plus, they have all kinds of stuff for anything older.

There is really no reason not to rebuild a pump. The castings don't wear out.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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