Fuel Pump Question
06-19-2007, 09:17 PM
#1
Thread Starter
Join Date: Dec 2006
Location:
Posts: 28
Fuel Pump Question
I am going to be changing my fuel pump because of problems with fuel pressure that is only getting worse. I'm not 100% what's been done to my engine but its not stock. It's had some work on the heads, changed cam, 70mm TB, 75 or 80mm MAF. I am looking at buying a BBK hi flo 110 or 155LPH but not sure if going with 155LPH will make my car run worse or better.
Right now i am running at 35 pounds pressure idle, when i turn A/C on the car dies out, pressure drops to about 15 pounds then builds back up to 39 pounds over about 15 seconds. When i crank car goes back down to 35 pounds. Any suggestions would be appreciated.
Thanks.
Right now i am running at 35 pounds pressure idle, when i turn A/C on the car dies out, pressure drops to about 15 pounds then builds back up to 39 pounds over about 15 seconds. When i crank car goes back down to 35 pounds. Any suggestions would be appreciated.
Thanks.
06-19-2007, 09:25 PM
#4
6th Gear Member
Join Date: Nov 2006
Location: Spfld, MA
Posts: 9,240
RE: Fuel Pump Question
ORIGINAL: white93pony
35 lbs is that with or without the vaccum hooked up? when you disconnect vaccum it should be at 39-40. shouldnt be that high hooked up
35 lbs is that with or without the vaccum hooked up? when you disconnect vaccum it should be at 39-40. shouldnt be that high hooked up
sigh
vacuum connected factory FPSI is 39
06-19-2007, 10:35 PM
#7
6th Gear Member
Join Date: Feb 2006
Location: Howard City, MI
Posts: 5,956
RE: Fuel Pump Question
ORIGINAL: DW302
I am going to be changing my fuel pump because of problems with fuel pressure that is only getting worse. I'm not 100% what's been done to my engine but its not stock. It's had some work on the heads, changed cam, 70mm TB, 75 or 80mm MAF. I am looking at buying a BBK hi flo 110 or 155LPH but not sure if going with 155LPH will make my car run worse or better.
Right now i am running at 35 pounds pressure idle, when i turn A/C on the car dies out, pressure drops to about 15 pounds then builds back up to 39 pounds over about 15 seconds. When i crank car goes back down to 35 pounds. Any suggestions would be appreciated.
Thanks.
I am going to be changing my fuel pump because of problems with fuel pressure that is only getting worse. I'm not 100% what's been done to my engine but its not stock. It's had some work on the heads, changed cam, 70mm TB, 75 or 80mm MAF. I am looking at buying a BBK hi flo 110 or 155LPH but not sure if going with 155LPH will make my car run worse or better.
Right now i am running at 35 pounds pressure idle, when i turn A/C on the car dies out, pressure drops to about 15 pounds then builds back up to 39 pounds over about 15 seconds. When i crank car goes back down to 35 pounds. Any suggestions would be appreciated.
Thanks.
http://www.jdsperformance.com/index....m&inmake=0
Something else to think about, our mustangs run a looped fuel system, or a return style system, you can pump as much fuel as you can but it will only use what it needs and send the rest/extra back to the tank. If you plan on any more upgrades, but a 255lph, and with the work you have done, you might as well get at least a 190LPH Walbro.
06-19-2007, 10:43 PM
#8
Thread Starter
Join Date: Dec 2006
Location:
Posts: 28
RE: Fuel Pump Question
It is running 35 with vacuum connected. I haven't tried disconnected. Should i maybe be looking at something other than Fuel Pump, i changed the filter under tank last year. I cleaned and checked wiring also. Thanks for link i heard BBK was made by Walbro but didn't know the price would be that much cheaper.
06-19-2007, 11:17 PM
#9
5th Gear Member
Join Date: Jan 2006
Location:
Posts: 2,760
RE: Fuel Pump Question
I don't understand why people don't go straight to a 255lph. You have a return for the extra. And like 50stanger said, www.jdsperformance.com.
06-19-2007, 11:29 PM
#10
Thread Starter
Join Date: Dec 2006
Location:
Posts: 28
RE: Fuel Pump Question
Well for me i just didn't know and time is a factor since my car is parked and can't keep stealing my wifes car. But now that i do know i will be getting the 255lph Walbro from http://www.jdsperformance.com/