# Fuel pressure drop
**URL:** https://forums.speedlife.net/t/fuel-pressure-drop/265591
**Category:** Shift518 Automotive
**Created:** [November 25, 2012, 12:26pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591 "2012-11-25T12:26:05Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Progress](https://forums.speedlife.net/u/Progress)
#### Post date: [November 25, 2012, 12:26pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591/1 "2012-11-25T12:26:05Z")
I been using 340 aeromotive in tank fuel pump with factory fuel lines without any problems. I upgraded my fuel lines to a -6 feed and return. My car is set to 7psi of boost and 50psi of fuel pressure. When i’m boosting i c 57psi of fuel pressure up to 5500rpm and after it’s loosing pressure. I never had this issue before i upgraded my fuel lines. I’m still using factory fuel pump wiring. Any knowledge on this issue.
Thanks
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### Author:  [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)
#### Post date: [November 25, 2012, 3:00pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591/2 "2012-11-25T15:00:09Z")
Aeromotive shit sucks ! Prolly had no issue keeping pressure on small stock lines and now ya have bigger lines it needs to push more fuel to keep pressure . Think of it as the garden hose /straw effect bigger hose needs more volume to keep pressure ,smaller straw needs less volume to keep pressure .
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### Author:  [@GermanPSI](https://forums.speedlife.net/u/GermanPSI)
#### Post date: [November 25, 2012, 3:48pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591/3 "2012-11-25T15:48:10Z")
Check the FPR, and also the vaccumm line going to it
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### Author:  [@Bryan90GL-X](https://forums.speedlife.net/u/Bryan90GL-X)
#### Post date: [November 25, 2012, 4:08pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591/4 "2012-11-25T16:08:04Z")
Can you log voltage and/or amperage at the pump while youre driving?
Might want to consider a pump rewire depending on what you find.
> **[11140\_11141\_11142.pdf](https://aeromotiveinc.com/wp-content/uploads/2012/02/11140_11141_11142.pdf)**
>
> 5.89 MB
Theres a chart showing pressure vs current draw, plus a diagram for a rewire if you need it.
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### Author:  [@Progress](https://forums.speedlife.net/u/Progress)
#### Post date: [November 25, 2012, 4:45pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591/5 "2012-11-25T16:45:50Z")
Thanks for the respond. The regulator and vacuum hose is good. It holds pressure up to 5500 rpm. I will check the voltage at load c if it drops and will rewire the pump with a bigger gauge wire. If that wont help will change pump. Let u know thanks again.
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### Author:  [@Boxersix](https://forums.speedlife.net/u/Boxersix)
#### Post date: [November 25, 2012, 5:18pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591/6 "2012-11-25T17:18:14Z")
Rewrite the pump for certain. Most times in this scenario that’s the fault
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### Author:  [@Progress](https://forums.speedlife.net/u/Progress)
#### Post date: [November 29, 2012, 9:24pm UTC](https://forums.speedlife.net/t/fuel-pressure-drop/265591/7 "2012-11-29T21:24:28Z")
Problem solved. It was a two day old XRP inline 10 micron fuel filter that mounts after the fuel pump and before the fuel rail. Since the filter has stainless steel screen i boil it for a hour and it was good after that. Will check on it in a week or two. Filter size 2.5" long, 1" diameter, so it dont cover so much area for filtering. Most likely ill be ordering a high flow filter.
Thanks again