fuel pump bypass

Old 06-23-2008, 10:32 AM
  #1  
john858
Senior Member
EXPERT BUILDER
Thread Starter
 
Join Date: Jan 2007
Location: atwood,Ky
Posts: 302
Default fuel pump bypass

car is langing just before shift, has anyone had a problem with bypass lang with a rear electric pump? i'm thinking about blocking off bypass to see if that stops the problem.it's a 402bb 1.76 glide 5000 stall 488 rear on alky leaving at 3200 & shifting at 6000 was leaving at 3600 & shifting at 6500 made no differance except slow the car down of coarse.any help would be great cause i'm runnin out of thoughts . thanks guys
john858 is offline  
Old 06-28-2008, 04:34 AM
  #2  
john858
Senior Member
EXPERT BUILDER
Thread Starter
 
Join Date: Jan 2007
Location: atwood,Ky
Posts: 302
Default

anybody out there???????????? :cry:
john858 is offline  
Old 06-28-2008, 05:03 AM
  #3  
hammertime
Senior Member
RACING JUNKIE
 
Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Default Re: fuel pump bypass

Originally Posted by john858
car is langing just before shift, has anyone had a problem with bypass lang with a rear electric pump? i'm thinking about blocking off bypass to see if that stops the problem.it's a 402bb 1.76 glide 5000 stall 488 rear on alky leaving at 3200 & shifting at 6000 was leaving at 3600 & shifting at 6500 made no differance except slow the car down of coarse.any help would be great cause i'm runnin out of thoughts . thanks guys

Explain the fuel system what pump and pressure you running ?
hammertime is offline  
Old 06-28-2008, 08:00 AM
  #4  
sg1586
Senior Member
MASTER BUILDER
 
Join Date: Dec 2003
Posts: 185
Default

Also give us a time slip info and how heavy it is....
sg1586 is offline  
Old 06-29-2008, 06:09 AM
  #5  
john858
Senior Member
EXPERT BUILDER
Thread Starter
 
Join Date: Jan 2007
Location: atwood,Ky
Posts: 302
Default

we are running electic from the rear,i think it's pro. products,but this weekend i went ahead & block the bypass off to see if that would help,that seem to take care of the problem. car's 2900 with driver it was losing time in the 330' just before it shifted,we are running about 8# of pressure.the bypass is in the pump. reg.is about 12" from carb.could the regulatar cause a flow problem also? i just have a cheap holley reg. on it.thanks for any help.
john
john858 is offline  
Old 06-29-2008, 06:31 AM
  #6  
sg1586
Senior Member
MASTER BUILDER
 
Join Date: Dec 2003
Posts: 185
Default

Sounds like the regulator....I have the large BG regulator. You also need to get it close to the carb from what Im told....Here's a pick of the way I have mine set up....
sg1586 is offline  
Old 06-29-2008, 01:59 PM
  #7  
john858
Senior Member
EXPERT BUILDER
Thread Starter
 
Join Date: Jan 2007
Location: atwood,Ky
Posts: 302
Default

thanks sg1586 thats another thing i was going to do just to be safe.
john858 is offline  
Old 06-29-2008, 06:37 PM
  #8  
topcat572
Senior Member
MASTER BUILDER
 
Join Date: Nov 2004
Location: Port Sulphur, La.
Posts: 139
Default regulator

Nice bracket for the regulator, Who makes it?
topcat572 is offline  
Old 08-21-2008, 10:10 PM
  #9  
dparker
Senior Member
RACING JUNKIE
 
Join Date: Jun 2003
Location: Hobbs, NM
Posts: 842
Default Re: fuel pump bypass

Originally Posted by john858
car is langing just before shift, has anyone had a problem with bypass lang with a rear electric pump? i'm thinking about blocking off bypass to see if that stops the problem.it's a 402bb 1.76 glide 5000 stall 488 rear on alky leaving at 3200 & shifting at 6000 was leaving at 3600 & shifting at 6500 made no differance except slow the car down of coarse.any help would be great cause i'm runnin out of thoughts . thanks guys
Check your fuel pressure from the pump to the regulator, It should be around 20 psi. If so the pump is not your problem.
1. You need 11.9 volts or more at all times for a high flow pump.
2.With alcohol I'd run 12an to the pump and a 10 an to the regulator and 8an to carb. Step down 2 between each.
3. A good regulator is a must have.
4. Run fuel out of both sides of your regulator not out of just one side.
5. Make sure your fuel bowl level isn't low.
6. If your running a filter(should be 100 micron stainless) check to see if its not getting plugged.
7. Make sure your using a relay on a high flow pump.
8. Make sure your not cavitating your fuel in the tank as it returns. High flow pumps return more fuel than you might think. I run foam in my cell.
9. If you have any water in your alcohol it will do that also.
Just a check list to help you out.
take care and good luck.
dparker is offline  
Old 08-22-2008, 05:01 PM
  #10  
sg1586
Senior Member
MASTER BUILDER
 
Join Date: Dec 2003
Posts: 185
Default Re: regulator

Originally Posted by topcat572
Nice bracket for the regulator, Who makes it?


http://www.competitionmotorsports.us/fuel_brackets.php
sg1586 is offline  

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service