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BB mech fuel pump ??s #1071156 09/07/11 09:45 PM 09/07/11 09:45 PM
Joined: Jan 2003 Posts: 21,774 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 21,774 A collage of whims	Project is a 448" RB (maybe 530HP), just a low-12-sec street-strip '64 Savoy wagon. Occasional 8-hour highway trip. Running 1/2" fuel line from tank through filter & Holley 110, forward to a mech pump. From there I'll run -6 or -8 hose to a Holley regulator with a PSI-gauge fitting & into the Holley bowls. O'Reilly replacement mech pump lacks threaded fittings, and that's the only one they list. I want threads, dang it. Will a Hemi stock replacement pump have the threaded fittings, will it work on an RB (I would think so), and is a stock mech pump OK for this? Or should I just quit being cheap and step up to a better mech pump? My Street Hemi RR runs basically the same fuel system but a high-flow mech pump, since it makes more power, has the 2 carbs, and turns more RPM. If the electric pump is off, the mech pump can't keep the 1/2" line full & under pressure for very long.

Re: BB mech fuel pump ??s [Re: topside] #1071157 09/07/11 09:56 PM 09/07/11 09:56 PM
Joined: Oct 2010 Posts: 2,428 Ambridge, Pa. R rickraw top fuel
rickraw top fuel R Joined: Oct 2010 Posts: 2,428 Ambridge, Pa.	a holley pump won't push through a mechnical pump. ur holley pump should be enough. stay safe, seeya.

Re: BB mech fuel pump ??s [Re: topside] #1071158 09/08/11 09:16 AM 09/08/11 09:16 AM
Joined: Jan 2003 Posts: 75,326 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,326 A gulag near you.	Hemi pump will fit the 440 .

Re: BB mech fuel pump ??s [Re: JohnRR] #1071159 09/08/11 10:00 AM 09/08/11 10:00 AM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	the carter mech pumps have 1/4" pipe thread, the edelbrocks have 3/8" pipe thread.

Re: BB mech fuel pump ??s [Re: JohnRR] #1071160 09/08/11 10:04 AM 09/08/11 10:04 AM
Joined: Jan 2003 Posts: 4,448 Phoenix, AZ M MoparBilly master
MoparBilly master M Joined: Jan 2003 Posts: 4,448 Phoenix, AZ	Bought one of those Carter re-pops from Mancini...very happy with it, money well spent, I feel. "Livin' in a powder keg and givin' off sparks" 4 Street cars, 5 Race engines

Re: BB mech fuel pump ??s [Re: MoparBilly] #1071161 09/08/11 10:54 AM 09/08/11 10:54 AM
Joined: Jan 2003 Posts: 21,774 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 21,774 A collage of whims	Makes sense to have a mech pump in case the Holley quits on the road; even a stock pump will re-fire the car and get it a short distance with the 1/2" line until the PSI drops. The Eddy, Mancini, Holley & Carter would be a step up from stock. I like the Eddy 3/8" NPT size. The Holley & Carter are both 1/4" NPT but that hasn't been a problem with my Hemi when the electric pump is on. I guess I need to know what the stock replacement Hemi pump puts out and whether it will have fittings.

Re: BB mech fuel pump ??s [Re: topside] #1071162 09/08/11 12:18 PM 09/08/11 12:18 PM
Joined: Jun 2005 Posts: 301 central Pa. 7 71Pan enthusiast
71Pan enthusiast 7 Joined: Jun 2005 Posts: 301 central Pa.	Clay Smith pump

Re: BB mech fuel pump ??s [Re: MoparBilly] #1071163 09/08/11 12:43 PM 09/08/11 12:43 PM
Joined: Jan 2003 Posts: 4,285 Ohio 6 64dodge572 master
64dodge572 master 6 Joined: Jan 2003 Posts: 4,285 Ohio	Quote: Bought one of those Carter re-pops from Mancini...very happy with it, money well spent, I feel. Same pump I have run on my car with 1 and 2 carb combos. Have been high 10's at 124 mph with 3/8 fuel line. Why do you think you need 1/2 line?

Re: BB mech fuel pump ??s [Re: topside] #1071164 09/08/11 04:19 PM 09/08/11 04:19 PM
Joined: Aug 2003 Posts: 43,911 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,911 Bend,OR USA	Quote: Makes sense to have a mech pump in case the Holley quits on the road; even a stock pump will re-fire the car and get it a short distance with the 1/2" line until the PSI drops. The Eddy, Mancini, Holley & Carter would be a step up from stock. I like the Eddy 3/8" NPT size. The Holley & Carter are both 1/4" NPT but that hasn't been a problem with my Hemi when the electric pump is on. I guess I need to know what the stock replacement Hemi pump puts out and whether it will have fittings. Yuo have a PM on this Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: BB mech fuel pump ??s [Re: topside] #1071165 09/08/11 04:22 PM 09/08/11 04:22 PM
Joined: Jan 2003 Posts: 26,887 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 26,887 Rio Linda, CA	Quote: If the electric pump is off, the mech pump can't keep the 1/2" line full & under pressure for very long. Not all electric pumps allow "pull-through"; IOW, when they quit the mechanical pump is pulling against a fully or partially blocked passage. If you want to run the electric pump part time only you will need a pump that allows pull-through or use check valves to bypass the inop electric pump. The INTERNET, the MISinformation superhighway

Re: BB mech fuel pump ??s [Re: John_Kunkel] #1071166 09/08/11 04:38 PM 09/08/11 04:38 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	Quote: Quote: If the electric pump is off, the mech pump can't keep the 1/2" line full & under pressure for very long. Not all electric pumps allow "pull-through"; IOW, when they quit the mechanical pump is pulling against a fully or partially blocked passage. If you want to run the electric pump part time only you will need a pump that allows pull-through or use check valves to bypass the inop electric pump. john, what check valves to you recommend to go around the electric pump?

Re: BB mech fuel pump ??s [Re: topside] #1071167 09/08/11 05:02 PM 09/08/11 05:02 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	What kind of filter do plan for in front of the pump? I think you pretty much have to pick one or the other because both won't work very well if at all together. imo Oversize inlet line won't hurt a thing just as long as it's tight/no leaks. Bigger is better with gasoline. Is it necessary with some pumps? probably not with a mechanical pump. It's a good idea for electric though.

Re: BB mech fuel pump ??s [Re: Challenger 1] #1071168 09/08/11 07:44 PM 09/08/11 07:44 PM
Joined: Jan 2003 Posts: 21,774 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 21,774 A collage of whims	1. The electric & mech setup works fine together in my Hemi car. Please see earlier post. 2. 1/2" line is planning for the future in case the Quicker Bug bites me, plus I had a bunch of line, hose & fittings. 3. If the Blue croaks on the road, I'll just bypass it with a union. 4. I've pretty much talked myself into a better/race mech pump instead of the cheaper OEM deal. The rest of the project's becoming over-built anyway; see #2 above. 5. Back at ya, Cab. 6. Same Earl's or Summit filter before the Blue that I use on my other cars, plus a sock of some kind on the pickup. Thanks to all for the responses, BTW.

Re: BB mech fuel pump ??s [Re: topside] #1071169 09/08/11 08:28 PM 09/08/11 08:28 PM
Joined: Jan 2004 Posts: 883 Pittsburgh, Pa J Jeff_383 super stock
Jeff_383 super stock J Joined: Jan 2004 Posts: 883 Pittsburgh, Pa	Clay Smith mechanical pump will be more than enough alone.

Re: BB mech fuel pump ??s [Re: Jeff_383] #1071170 09/08/11 08:41 PM 09/08/11 08:41 PM
Joined: Jan 2003 Posts: 21,774 A collage of whims topside OP Too Many Posts
topside OP Too Many Posts Joined: Jan 2003 Posts: 21,774 A collage of whims	Anyone running the Clay Smith pump? Their website claims 14-16 PSI & 140 GPH - that's huge! $145.00 from them, not listed @ Summit.

Re: BB mech fuel pump ??s [Re: topside] #1071171 09/09/11 09:24 AM 09/09/11 09:24 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	For what you want a 3/8 line and either the holley or carter high output mech pumps will be fine. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: BB mech fuel pump ??s [Re: lewtot184] #1071172 09/09/11 02:09 PM 09/09/11 02:09 PM
Joined: Jan 2003 Posts: 26,887 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 26,887 Rio Linda, CA	Quote: john, what check valves to you recommend to go around the electric pump? Earl's and Summit have nice one-way check valves but they aren't cheap, the one in the link below should do the job for less money. With all check valves you have to be aware of the "cracking pressure", the pressure need to upset the spring loaded poppet valve..if it's too high the mechanical pump's suction might not open it. In such cases I just open the valve and adjust the spring to just barely close the valve poppet. http://sto00.mailcar.net/catalog/index.p..._medium=RssFeed Here's one way to set up the valve on a Holley style pump. 6818363-FuelPumpBypass.jpg (113 downloads)

Re: BB mech fuel pump ??s [Re: John_Kunkel] #1071173 09/09/11 03:04 PM 09/09/11 03:04 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	thanks, john.

Re: BB mech fuel pump ??s [Re: John_Kunkel] #1071174 09/09/11 03:08 PM 09/09/11 03:08 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	I can tell you haven't run that pump before that picture was taken, have you run it much since? The inlet fittings are too small for hot weather use or anytime. imo

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