Fuel pressure question.
02-22-09, 10:00 PM
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Fuel pressure question.
so i got a new fuel pump cause the stock one on my SA so now i am running a holley eletric fuel pump thats adjustable from 9psi to 14psi i put it on and have been playing witht he thing all day and i cant get it to idle i dont know why it just wont unless i turn it to the 14psi but still idles like ***, would it be the carb? im out of ideas any info would help thank you.
02-22-09, 11:18 PM
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What kind of carb are you running?? If it is the stock, run it at about 2- 2-1/2 psi fuel pressure ( thats what i run on my race car). let me know how things go.
Greg
Greg
02-23-09, 03:29 AM
#3
yeah - maybe TOO much pump bro!! Dinky little stock Nikki doesn't need much gas 
Presume it idled fine with old pump? Old pump dead? Otherwise pop back in and see if it runs properly again. Did you change out the fuel filter too?? Very important!!
Stu Aull
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Alaska
Presume it idled fine with old pump? Old pump dead? Otherwise pop back in and see if it runs properly again. Did you change out the fuel filter too?? Very important!!
Stu Aull
80GS
Alaska
02-23-09, 03:49 AM
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fuel pressure regulater might help but I don't know. what I do know is thats alot of pressure unless you have 700cfm plus, and a large port. or fuel injection, but i think its a bit overboard.
02-23-09, 09:13 AM
#7
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I think that's going to be too much pump for any carb. Either way, you're going to need a regulator. Check out this thread for more details and installation instructions:
https://www.rx7club.com//showthread.php?t=529605
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https://www.rx7club.com//showthread.php?t=529605
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02-23-09, 10:48 PM
#10
Get a good gauge and put it before the carburetor.
Also, get a GOOD regulator (more than $20) and mount it no more than a foot and a half from the carb. Adjust it to 3psi.
Are you still running a return? If you have the nikki you should still have it.
Your fuel is flowing too much/fast and is flooding your car. Slow the volume/pressure and you will be set.
Also, get a GOOD regulator (more than $20) and mount it no more than a foot and a half from the carb. Adjust it to 3psi.
Are you still running a return? If you have the nikki you should still have it.
Your fuel is flowing too much/fast and is flooding your car. Slow the volume/pressure and you will be set.
02-25-09, 08:27 AM
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70 cubic inches of fury!
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You can pick up the same Holley regulator that comes with the blue or red pump for like 30 bucks at Advanced Auto or Autozone. The one that came with my pump was junk and didn't work, I put the new one on and problem solved. I would go get it and put it on and I bet it runs fine again. You have to have a gauge otherwise you have no clue were its really at. The regulator has one inlet and 2 outlets so u can run a gauge on one outlet.I am no carb guru but i am pretty sure u can hurt your carb running to much pressure? Here's a pic of my reg, there fairly simple.
[IMG]
[/IMG]
I ran 3/8 line for my new carb but yours is stock so you will need some teflon tape, two 3/8npt to 5/16 barb fittings,some hose clamps, and some 5/16 gas line. If you get a cheapy gauge like mine I think its a "mr.gasket" (wich should be right on any parts store shelve) you will need a 3/8npt to 1/8npt reducer to put the gauge on the regulator. I put a 90 degree elbow on mine just so it was easier to read the gauge. Hope that helps.....good luck.
[IMG]
[/IMG]I ran 3/8 line for my new carb but yours is stock so you will need some teflon tape, two 3/8npt to 5/16 barb fittings,some hose clamps, and some 5/16 gas line. If you get a cheapy gauge like mine I think its a "mr.gasket" (wich should be right on any parts store shelve) you will need a 3/8npt to 1/8npt reducer to put the gauge on the regulator. I put a 90 degree elbow on mine just so it was easier to read the gauge. Hope that helps.....good luck.
02-25-09, 10:34 AM
#13
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There's a tiny orifice inside the return line banjo fitting. This is being overwhelmed by the extra pressure.
Your best bet with working with what you have is to dead-head the return line on the carb, and use the regulator in a by-pass manner to feed the carb, so that the return line is hooked up to the regulator. In the photo posted by black82gsl, the inlet stays the same (obviously), the hose he has feeding the carb then goes to the return line, and the carb inlet would be hooked up to where he has his pressure guage. Of course this means an additional tee to add the gauge to the carb line. -Or, you could deadhead the carb return line with the guage. Either way, you're bypassing the carb with the rest of the fuel flow, and olny allowing the carb access to the regulated pressure. But this will only work if the regulator can get down to 3 psi or less, and with such volume coming from that massive pump, you may styill have trouble.
Your best bet with working with what you have is to dead-head the return line on the carb, and use the regulator in a by-pass manner to feed the carb, so that the return line is hooked up to the regulator. In the photo posted by black82gsl, the inlet stays the same (obviously), the hose he has feeding the carb then goes to the return line, and the carb inlet would be hooked up to where he has his pressure guage. Of course this means an additional tee to add the gauge to the carb line. -Or, you could deadhead the carb return line with the guage. Either way, you're bypassing the carb with the rest of the fuel flow, and olny allowing the carb access to the regulated pressure. But this will only work if the regulator can get down to 3 psi or less, and with such volume coming from that massive pump, you may styill have trouble.
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