Pressure fluctuates what to do?
Thread Starter
TECH Apprentice
Joined: Oct 2006
Posts: 322
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From: Wichita, Ks.
Pressure fluctuates what to do? Recently changed in-tank pumps due to my Aeromotive A1000 starving the pick-up at low volumes. Went with a Bosch pump.
I have 44.5 # injectors, Fast rails and run 58psi.
Now with new pump at 3/4 throttle, accelerating I get a brief pressure drop from 58psi to 52psi. The motor doesn't nose over, I can't tell that it affects it at all. It is a parallel set-up with the regulator behind the injectors.
Should I be concerned? Is this a tuning fix?
My Aeromotive stayed rock solid at 58psi, but it moved alot of fuel.
I have 44.5 # injectors, Fast rails and run 58psi.
Now with new pump at 3/4 throttle, accelerating I get a brief pressure drop from 58psi to 52psi. The motor doesn't nose over, I can't tell that it affects it at all. It is a parallel set-up with the regulator behind the injectors.
Should I be concerned? Is this a tuning fix?
My Aeromotive stayed rock solid at 58psi, but it moved alot of fuel.
If the pressure drops, the car goes lean unless it was [not the right way to do it] tuned around the pressure drop from the beginning. If it was tuned at a stable 58psi though and it falls now, then the car is leaning out. The PCM cannot see fuel pressure and at heavy to WOT cannot make correction.
Not sure of your exact configuration....
Are you running aftermarket lines?
What brand of regulator?
Is a vac line attached to the regulator & where it is connected?
How long does the the pressure remain low?
Give me some more info & I'll try to help.
Are you running aftermarket lines?
What brand of regulator?
Is a vac line attached to the regulator & where it is connected?
How long does the the pressure remain low?
Give me some more info & I'll try to help.
Thread Starter
TECH Apprentice
Joined: Oct 2006
Posts: 322
Likes: 0
From: Wichita, Ks.
Great, have a modified Ricks mini tub tank which we added extra baffle doors to help with slosh. Recently switched pumps as stated above.
It is a custom parrallel feed/return line set-up. Y block split into two lines that feed the FAST High Flow rails with a Weldon regulator on the return side, I don't think it has a vaccum line- I'll look tonight. Bosch 44.5# injectors.
With the Aeromotive pump I never had fluctuations upon acceleration, but with low fuel volumes in tank and when cornering (slosh) it would starve the pick-up. At fuller tank volumes- no problems. Rock steady pressures. Switched pumps thinking that the Aeromotive was moving alot of fuel so fast that at low volumes it would starve at the pick-up.
Switched pumps and now on 3/4 throttle acceleration I'll get a brief, maybe 1-2 maybe 3second drop in pressure from 58psi to 53 or 52psi, then it recovers.
Thanks for any input.
Dave
It is a custom parrallel feed/return line set-up. Y block split into two lines that feed the FAST High Flow rails with a Weldon regulator on the return side, I don't think it has a vaccum line- I'll look tonight. Bosch 44.5# injectors.
With the Aeromotive pump I never had fluctuations upon acceleration, but with low fuel volumes in tank and when cornering (slosh) it would starve the pick-up. At fuller tank volumes- no problems. Rock steady pressures. Switched pumps thinking that the Aeromotive was moving alot of fuel so fast that at low volumes it would starve at the pick-up.
Switched pumps and now on 3/4 throttle acceleration I'll get a brief, maybe 1-2 maybe 3second drop in pressure from 58psi to 53 or 52psi, then it recovers.
Thanks for any input.
Dave
Dave
Is this in the stock bucket?
Is the sock in the bucket or outside?
Is the venturi functioning?
Feel free to call me to discuss.
724-322-8505 until 11:00pm eastern time
Is this in the stock bucket?
Is the sock in the bucket or outside?
Is the venturi functioning?
Feel free to call me to discuss.
724-322-8505 until 11:00pm eastern time
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Thread Starter
TECH Apprentice
Joined: Oct 2006
Posts: 322
Likes: 0
From: Wichita, Ks.
Thanks Lonnie, No sock. Pick -up tube into 10 micron filter. No bucket, just baffling around pick-up tube. Custom Ricks tank into my 69 Camaro with an LS7
.
.
Last edited by ss dave; Jan 15, 2009 at 08:23 AM.
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