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  #1 (permalink)  
Old 07-27-2005, 07:11 PM
its not my fault
 
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kind of cutting out

cutting out problem. i have a camaro with a 350 ,performer cam?, 9.0 compression. holley 600 vac, gm hei 14+21=35 totla timming. fed by a summit electric fuel pump w' line set at 6.5 psi. linked to a 5spd trans and 3.08 gears?

when im accelerating hard through the gears i make it to 3rd and it starts loosing power. almost cutting out, but if i push in the clutch, its fine. just purrs back to idle. if i burn out hard it will happen at the end of 2nd. sometimes it wont happen till the end of 3rd. if i accelerate at part throttle it pulls through all gears normally.( the WOT is set on the carb)

the holley 600 has vac secondaries. the idles screws are 1.75 turns out . the secondary plates are set just closing. the secondary spring is purple. the PV is a 6.5 and new. i have a 3" af on a drop base aircleaner(its a camaro). the accel pump is set correctly. vacuum connections are cool. the distributor is connected directly to the bat 12V. turnning the distributor doesnt help. the vacuum secondary spring will slow the car down and delay when the cutout will occur. it wont fix the cut out.

help?

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Old 07-27-2005, 07:16 PM
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wind & fire = guides to power
 
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It sounds like you are running out of fuel.
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Old 07-27-2005, 07:27 PM
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what can the summit pump kit 7a support. it is speced at 110 gph and 5- 12 psi. shouldnt it be good for a 14 sec car?
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Old 07-27-2005, 07:36 PM
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I agree. Sounds like she's struggling for some juice. When you push the clutch in (I'm assuming you aren't power shifting and holding the throttle down while letting the clutch out) you are disconnecting the engine from the rest of the drivetrain, leaving the engine to be independent of RPM setters (ie wheels/timing in the case of coasting down the highway).

Make sure you are getting enough pressure. What kind of fuel lines are you running? How big? Doesn't matter how much pressure a fuel pump puts out, if it can't push it to the carb with a wide enough line then it's useless.
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Old 07-27-2005, 07:46 PM
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dash 6.

how can i test its output?
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Old 07-27-2005, 08:10 PM
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Quote:
Originally Posted by SpankyNuts
dash 6.

how can i test its output?
check out BARRY GRANTs web page he has a good test and good suggestions on fuel system set ups (plumbing). He uses a 1 gallon can to test the fuel output . I can not remember the rest but it is a good test of the fuel system.

-8 or -10 from the tank to the pump and -6 or -8 to the carb
at least .......... -10 tank to pump and -8 to the carb is best I think good to 800hp ....... happy burn outs
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Old 07-27-2005, 08:13 PM
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try turning the mix screws out another 1/4 and bumping the fuel pressure to 7 - 7.5psi. and if that doesnt help turn the screw out another 1/8th - 1/4. what size jets do you have in the carb? you may need to go up 1 or 2 sizes.

also... check to make sure your getting a full 12 - 13V to the distributor. if you get anything less that 12V to an HEI then it wont work properly.

check that and let us know if it works or not. good luck!
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Old 07-27-2005, 08:38 PM
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I had a two barrel holly 600 on my stock car and had the same type of problem at the end of the straightaways. Changed the jets to the next larger size and the problem was solved.
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Old 07-28-2005, 08:17 AM
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okay, but the kit only came with one size line. the tank side line needs to be bigger? i need fitings too?

on the regulator, the psi wont go over 7 psi. whats up with that? i need to attach a psi gauge , with a line and bring it into the cabin, to the fuel psi outlet. this will show when i run out of fuel. i hope. i wasnt suspecting i was out of fuel, but it makes sense.
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Old 07-31-2005, 10:17 AM
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what does the screw on the base of the summit electric pump do?

does that effect output psi?
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Old 07-31-2005, 10:29 AM
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check your float level, may be too low
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