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Old 07-05-2005, 17:22   #1 (permalink)
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Fuel System Dramas

Having troubles getting my engine to run rite with the current fuel set up, carb is a 950HP holley, with a holley blue, 3/8 line, holley regulator.
I find that when the regulator is fully open the car feels ok, but when it is et at 7psi it feels like the car is holding back? Are the holley regs. restrictive?
The jet sizes in the carb are 78s front and back, wat jet combinations work best? I know its a very vague question, but just wanna work out which tuning kit to get.......

thank guys much appriciated
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Old 07-05-2005, 17:26   #2 (permalink)
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Re: Fuel System Dramas

7 pounds is too high. Try dropping it a pound.
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Old 07-05-2005, 17:35   #3 (permalink)
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Re: Fuel System Dramas

Quote:
Originally Posted by Racer
7 pounds is too high. Try dropping it a pound.

i tried lowering it, but seemed to go worse? it coughs a splutters really bad, ran the carb with a standard mechanical pump and it went fine, thats why i think it might be sumthing to do with the reg. Are the holleys are supposed to be pretty good out of the box tune wise?
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Old 07-05-2005, 19:15   #4 (permalink)
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Re: Fuel System Dramas

How accurate is your gauge? Can you try another one to verify its callibration?

Where do your float bowl levels sit?
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Old 07-05-2005, 19:28   #5 (permalink)
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Re: Fuel System Dramas

Quote:
Originally Posted by Jet711
Having troubles getting my engine to run rite with the current fuel set up, carb is a 950HP holley, with a holley blue, 3/8 line, holley regulator.
I find that when the regulator is fully open the car feels ok, but when it is et at 7psi it feels like the car is holding back? Are the holley regs. restrictive?
The jet sizes in the carb are 78s front and back, wat jet combinations work best? I know its a very vague question, but just wanna work out which tuning kit to get.......

thank guys much appriciated
I had the very same problem with the holley reg. I changed over to a Mallory 3 port with return line and that fixed the problem. The trouble with the holly ones i have found is that once the line is full the pump bypass carnt cope with the volume of fuel were as the Mallory because it has the return line dosnt have that problem. Not only will the pump run cooler it will also run quiter as well. All i did for the return line was run it back in the the filler neck. Also with the Mallory you only need to run 3-5 psi
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Old 07-05-2005, 19:35   #6 (permalink)
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Re: Fuel System Dramas

Quote:
Originally Posted by Jet711
Having troubles getting my engine to run rite with the current fuel set up, carb is a 950HP holley, with a holley blue, 3/8 line, holley regulator.
I find that when the regulator is fully open the car feels ok, but when it is et at 7psi it feels like the car is holding back? Are the holley regs. restrictive?
The jet sizes in the carb are 78s front and back, wat jet combinations work best? I know its a very vague question, but just wanna work out which tuning kit to get.......

thank guys much appriciated
I'd be ditching the 3/8 fuel line in a hurry. Anything with half an engine will need 1/2" lines.
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Old 07-05-2005, 20:32   #7 (permalink)
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Re: Fuel System Dramas

Checked float levels there ok, that might be the go, a return line and 1/2 line to the carb, ive got a mate reg. plus his 830 which has been set up already so i might swap it all around and see what happens. Apparently there is a mallory mechanical pump which is good for 125 gph? Anybody heard about this? thanks guys......
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Old 07-05-2005, 21:05   #8 (permalink)
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Re: Fuel System Dramas

Quote:
Originally Posted by COUPEMAN
I'd be ditching the 3/8 fuel line in a hurry. Anything with half an engine will need 1/2" lines.
Not so, its a myth. What area do you think the combined jet openings are?
A LOT less than 1/2 inches.....a lot less than 3/8 inch...
Its volume that matters
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Old 07-05-2005, 21:06   #9 (permalink)
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Re: Fuel System Dramas

Quote:
Originally Posted by Racer
Not so, its a myth. What area do you think the combined jet openings are?
A LOT less than 1/2 inches.....a lot less than 3/8 inch...
Its volume that matters
ps
Unless you have a real weapon that spins to 8,500 rpm, and sees very limited street use, a 950HP is too big.
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Old 07-05-2005, 23:56   #10 (permalink)
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Re: Fuel System Dramas

Quote:
Originally Posted by Racer
ps
Unless you have a real weapon that spins to 8,500 rpm, and sees very limited street use, a 950HP is too big.

I checked it out the 950hp has the same size venturi as the 750, and the base is an 850, giving 800cfm......
The 850hp has larger venturies than the 950 as measured........
Does that sound rite?
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