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03-18-2006, 07:30 AM
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CC Member
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Join Date: Dec 2004
Location: Chattanooga, TN,
TN
Cobra Make, Engine: Superformance #1408
Posts: 80
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Not Ranked
Fuel Pump - Need a regulator
First, thanks guys for the help with the Victor Jr intake question. Much appreciated.
I need some advice on my fuel delivery situation. I'm in the process of upgrading to AFR 185 heads from the GT-40x (392 FRP crate engine), and was wondering if I'll run into fuel problems. I now have a Carter mechanical fuel pump, and my friend who's helping me with this (he's actually walking me through it step by step) strongly suggested I use a fuel pressure regulator. I'm using AN -8 throughout my fuel system and fuel is being delivered by a Jet Performance stage III modified Holly DP 750. Currently I'm jetted at 72's, front and rear.
On a side note, I was reading last night in a Ford performance book where they suggested AN -10 for anything over 450hp. Will -8 be enough for me? I plan on doing some track events from time to time, etc.
__________________
Jake - Ringgold, GA
Superformance #1408
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03-18-2006, 08:42 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Jake:
You should be OK with a Carter pump as long as it is not the High Pressure (race?) one. Standard 6lb will be fine without a regulator. -6 hose will work, that is about 3/8" in laymans terms, which is what many of the big block production cars used. If you start actually racing or increasing engine output you will need to step up to 7/16" or 1/2" line from the tank to the fuel pump. An may need to increase pump size too.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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03-18-2006, 09:09 AM
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CC Member
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Join Date: May 2004
Location: Springtown,
pa
Cobra Make, Engine: jbl in garage
Posts: 88
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Not Ranked
Jake
I am doing the same thing on a 351/385hp. Xs off and 185s on. Just got my Pro-Systems carb which flows 780+ true. They said 6-7# was just fine and I am -8 also. They also put in different throttle base to accommodate the increase flow for the 185s. Did tell me to check plugs and be prepared to jet up when the heads are switched.
Jack
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03-18-2006, 09:13 AM
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CC Member
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Join Date: Oct 2000
Location: Crystal Lake,
IL
Cobra Make, Engine: Everett-Morrison, 434 cid
Posts: 977
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Not Ranked
You didn't say which pump you have but, even the Carter Competition Series and Billet Series pumps don't need a regulator. These pumps do have the -10 inlet where the lower series pumps only have 1/4 NPT or stock fittings. If you aren't using a Competition or Billet pump you won't be able to utilize the flow of a -10 line. Your combination shouldn't need it anyway. For track work I would run a fuel pressure gage in the dash. IMO the fuel pressure gage is more important than the tach.
Scott
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03-18-2006, 10:16 AM
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CC Member
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Join Date: Dec 2004
Location: Chattanooga, TN,
TN
Cobra Make, Engine: Superformance #1408
Posts: 80
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Not Ranked
> the lower series pumps only have 1/4 NPT or stock fittings.
This sounds like what I have. I do, however, have a fuel pressure guage on my fuel log. Should the fuel pressure fluctuate or remain constant? I don't have the engine completely back together yet, and I never noticed the fuel pressure before. We should have all back together this evening.
BTW, thanks for the info everyone!
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Jake - Ringgold, GA
Superformance #1408
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03-18-2006, 06:40 PM
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CC Member
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Join Date: May 2005
Location: Ravenswood,
WV
Cobra Make, Engine: Late 70s Allied Industries?? 454 BBC; alum copo heads and intake THM 400 12 bolt posi ++ 06 CL 55 AMG
Posts: 201
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Not Ranked
When I purchased my old car -- it had a new Summit fuel pressure gauge and fuel filter and log feeding a Holley --- be careful -- the gauge blew on way back from our first small 20 mile trip -- could have caused a fire. Replaced with Mr. Gasket liquid filled gauge. No problems.
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03-18-2006, 08:00 PM
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CC Member
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Join Date: Sep 2001
Location: Danville,
CA
Cobra Make, Engine: CSX 6079 482CI CSX cross ram
Posts: 1,354
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Not Ranked
I am running a carter mechanical pump and I notice my fuel pressure is at 7-8lbs is this high? do I have a bad fuel pump or should I install a pressure regulator? I am having problems with a rich condition with my carbs (I just sent them to Pro Systems)
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03-22-2006, 08:03 PM
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CC Member
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Join Date: Sep 2003
Cobra Make, Engine:
Posts: 39
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Not Ranked
I ran a Carter Street/Strip pump on my 331. Had some tuning issues and put a gauge on the fuel line......9lbs at idle. Too much. 
Installed a regulator. 
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'89 LX 408...SCAT, Probe, AFR 205, Vic Jr, Pro-Systems, Rawls sft cam, UPR K & arms w/coil overs.....more to come! 
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