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06-02-2005, 05:04 PM
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CC Member
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Join Date: Apr 2005
Location: ellabell,
GA
Cobra Make, Engine: Concept, Boss351
Posts: 78
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one more question on electric fuel pumps
Ok after looking a litle harder now i know why the PO had an electric fule pump installed...he relocated the oil filter so its away from the header. so a mechanical pump is out of the question till i reroute it later. I bought another holly electric pump. this one has a regulator, where as the one that was on the car did not...how important is this regulator? Should i use it or not? these pumps are pretty much the same, Holly blue electric. it came with a standard regulator.
thanks, i can honestly say im learning alot from here...
scott
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06-02-2005, 06:08 PM
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Banned
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Join Date: Apr 2005
Location: Brookings,
OR
Cobra Make, Engine: P. O. of KMS 91,92,193,196,197,205,207,S024
Posts: 51
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I would mount the fuel pump (electric as close to the fuel tank as possible . personaly I prefer 2 in series but I am prone to overkill . Use the regulator and install as close to the intake as you can , good luck, jerry
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Past owner of:
KMS- 91, 92, 193, 196, 197, 205, 207 AND S024.
REAL SHELBY COBRA's OWNED
CSX 3355, 3358, 2200, 2571, 2295
GT40 #1086
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06-02-2005, 06:11 PM
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CC Member
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Join Date: Apr 2005
Location: ellabell,
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Cobra Make, Engine: Concept, Boss351
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2 pumps in series?...never seen that...then again there are alot of things i havent seen on these cars. the pump is located 3 inches away from the tank...
what woukd happen f i didnt run the regulator?....car didnt have one before. Im just curious as to why, builder error or doesnt need it.....
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06-02-2005, 06:14 PM
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Location: San Diego,
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The regulator will help insure you don't put too much pressure on the carb and overrun the carb and force gas in when not needed.
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06-02-2005, 06:18 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Scott,
You will need the supplied regulator with the blue pump.
I imagine it had the red pump,it doesn't need one.
red - 7 psi & 97 gph
blue - 14 psi & 110 gph.
You'll flood the carb and engine compartment without the reg..
Set it 6 - 7 psi
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06-02-2005, 06:19 PM
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CC Member
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Join Date: Apr 2005
Location: ellabell,
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Cobra Make, Engine: Concept, Boss351
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and would that cause a flooding condition?...when the old pump did work i used to get a run on when shutting down, and black smoke poofing out of the pipes under load. also used to get bogging when i booted on it.....wondering if that was one of my gremlins i have...
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06-02-2005, 06:20 PM
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Banned
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Join Date: Apr 2005
Location: Brookings,
OR
Cobra Make, Engine: P. O. of KMS 91,92,193,196,197,205,207,S024
Posts: 51
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I put a fuel pressure regulator on and a guage . that way you can adjust the fuel pressure and keep it constant and within the recommended specs of your carb again the 2 pumps can be considered overkill untill one goes out, jerry
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Past owner of:
KMS- 91, 92, 193, 196, 197, 205, 207 AND S024.
REAL SHELBY COBRA's OWNED
CSX 3355, 3358, 2200, 2571, 2295
GT40 #1086
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06-02-2005, 06:21 PM
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CC Member
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Join Date: Dec 2001
Location: Olympia/Lacey,
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Cobra Make, Engine: West Coast. 514 / 6 speed Richmond overdrive
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Highly recommend you use the regulator
My Holley electric fuel pump was putting out 14 psi which was 2 x the needed pressure, causing rich running and all kinds of other problems.. it came that way on my "turnkey" and when I rebuilt the engine (a looong story) I wisely added a fuel regulator and trimmed the pressure down to about 7 lbs. That was then, carb, this is now:
I'm changing over to EFI right now and it's going to be a big relief.. I hate carbs, erspecially in a car that can pull 1.1 gs and as a result flooded (overspill) on every hard corner or u-turn I took!
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06-02-2005, 06:22 PM
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Join Date: Apr 2005
Location: Brookings,
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Cobra Make, Engine: P. O. of KMS 91,92,193,196,197,205,207,S024
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with out question that was at least one of the problems
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Past owner of:
KMS- 91, 92, 193, 196, 197, 205, 207 AND S024.
REAL SHELBY COBRA's OWNED
CSX 3355, 3358, 2200, 2571, 2295
GT40 #1086
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06-02-2005, 06:38 PM
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CC Member
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Location: ellabell,
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you dont know how happy that makes me feel...lol....both pumps old and new are the same type....i tried everything from adjusting idle mix, jets, float etc etc etc...this was really driving me CRAZY....this car was built and then sold to me so im trying to kill all the gremlins...one by one by one.....now into the garage to see if it all comes together......
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06-02-2005, 07:51 PM
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Join Date: Apr 2005
Location: Brookings,
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Cobra Make, Engine: P. O. of KMS 91,92,193,196,197,205,207,S024
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Also I would recomend after you previous problems if your running a holley you probably should repace the power valves and check for dirt in the needle and seat
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Past owner of:
KMS- 91, 92, 193, 196, 197, 205, 207 AND S024.
REAL SHELBY COBRA's OWNED
CSX 3355, 3358, 2200, 2571, 2295
GT40 #1086
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06-02-2005, 08:33 PM
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CC Member
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Join Date: Apr 2005
Location: ellabell,
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Cobra Make, Engine: Concept, Boss351
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its an edlebrock, so hopefully i wont have an issue.....found another thing as i pulled the old one off,, the ground wire was attached to a PLASTIC wire tab the secure it to the frame. no metal on metal attachment...im sure that cause a few gremlins also....
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06-02-2005, 08:35 PM
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Location: Dadeville,
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Cobra Make, Engine: Sold my EM.
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Also, if your engine was running rich because of excess fuel pump pressure, you should probably change your oil before you run it much. Some of the fuel could have gotten past the rings and into the oil.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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06-02-2005, 08:44 PM
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Banned
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Join Date: Apr 2005
Location: Brookings,
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Cobra Make, Engine: P. O. of KMS 91,92,193,196,197,205,207,S024
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Right on tommy sorry I didn't think of that , jerry
__________________
Past owner of:
KMS- 91, 92, 193, 196, 197, 205, 207 AND S024.
REAL SHELBY COBRA's OWNED
CSX 3355, 3358, 2200, 2571, 2295
GT40 #1086
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06-02-2005, 08:58 PM
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CC Member
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Join Date: Apr 2005
Location: ellabell,
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Cobra Make, Engine: Concept, Boss351
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ok that will be done to...i guess im goin shoppin tomorrow....lol...i just want this done right....thanks everyone for this great info....
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06-03-2005, 07:21 AM
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CC Member
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Join Date: Dec 2003
Location: Ontario,
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Cobra Make, Engine: shell valley, all aluminum 540 ci chevy
Posts: 104
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That's a bad choice for pumps on a street driven vehicle with or without a regulator. If you put any amount of miles on the car the pump will not last long. You need a fuel return back to your tank to prevent pump from dead-heading which heats up the fuel and burns up the motor on the pump. These pumps are also very noisy. I would go with a BG hot rod pump with a fuel returning regulator. You will have to run another line back to the tank. Either this or go with a street mechanical pump. -Bob
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06-03-2005, 11:05 AM
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CC Member
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Location: Southwest,
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Cobra Make, Engine: Shell Valley, Mopar thingy (small block of course)
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If you are having carb problems you may want to talk to Don Gould (cuda66273 here) and get a carb and the proper pump all at once. The Edelbrock are OK for stock and slightly warmed over engine. They also have a tendency to develop a crack in the bowl and leak. This will also cause a hard starting problem if you had a mechanical pump as you have to crank the engine to fill the bowl back up. Not as big a deal with the electric fuel pump. They may have the cracking fixed on the new carbs by now too.
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Brent Dolphin
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06-03-2005, 01:53 PM
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CC Member
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Join Date: Apr 2005
Location: ellabell,
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id be more than happy to go back to a mechanical pump but now im concerned about the oil filter and the header....the PO put an adapter so it sticks forward of the motor so it will be away from the header , which gets in the way of the placement of the mechanical fuel pump...i should stress this car is just for cruising around and going to work with it once in a while....car shows, cruise nights etc etc....again this is a Boss351
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06-05-2005, 01:44 AM
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Holley blue pump has a heavier bypass spring than the red. Don't reckon there is any difference otherwise. You can change the spring if you don't want to run the reg.
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06-05-2005, 01:25 PM
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CC Member
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Location: ellabell,
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Ok i have just about had it...lol....i had gotten the Blue pump before i just read its a bad choice....the good news is the car now fires..bad news is it runs like crap...I am running a regulator on it and im getting between 6-7 PSI, I have tried to time the car..it seems like its where it needs to be....but its running rough and when i apply throttle it coughs and black smoke pumps out the pipes....Im using the MSD pro billet ready to run dist with MSD coil...edelbrock performer 351 intake with the matching carb 750cfm. no choke. I think the carb is all messed up but i really dont have the tools or the time to mess with all that...especialy with the work load the army is giving me...I need to find a facility in the savannah GA area that is reputable that can just go through this car...and get this cobra running right!.....I can do minor stuff but im not equiped for all this....
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