CDgr97GSX
15+ Year Contributor
- 137
- 4
- Feb 11, 2009
-
Romania,
Europe
Hello guys! I have a problem with my fuel pressure and I need some help from you guys to be able to fix the problem. I've upgraded the fuel lines with SS hoses with 8AN and 6AN for return, Walbro 525 with welded AN fittings on hanger, Fuelab pressure regulator and AEM fuel rail with fuel pressure sensor from Innovate ECF mounted in the fuel rail and logged to EcmLink. Once I started the fuel pump from EcmLink to set the base fuel pressure to 43psi I could see the pressure fluctuating from 35psi to 45 psi. I could adjust the pressure lower then 43psi so the drilled siphon wasn't a restriction.
Starting the engine and drive the car the fuel pressure is all over the place. I wanted to fix this problem so I removed the fuel pump and test it again for leaks, tested ok all the way to 80psi with no fuel leak. Since i had the pump out i've changed the fuel pump filter and after starting the fuel pump from EcmLink without the engine running the fuel pressure was steady at 43 psi but once i started the engine it started to fluctuate again.
Stopping the engine and test again only with the fuel pump running pressure was still fluctuating. Few days later i tested again only with the pump running and got a steady fuel pressure but once i start the engine it's starting to get jumpy. So my conclusion is that once the system it's losing the pressure over few days or by disconnect the lines then at first start of the pump the pressure is steady but once the engine is stated the pressure will fluctuate and will do so until the fuel pressure is dropping again.
I'm thinking it might be the regulator having the orifice to small for the Walbro pump or the 10 micron fuel filter i have installed before the fuel rail. I would like to hear what you guys think it might be the problem.
Thank you!
Starting the engine and drive the car the fuel pressure is all over the place. I wanted to fix this problem so I removed the fuel pump and test it again for leaks, tested ok all the way to 80psi with no fuel leak. Since i had the pump out i've changed the fuel pump filter and after starting the fuel pump from EcmLink without the engine running the fuel pressure was steady at 43 psi but once i started the engine it started to fluctuate again.
Stopping the engine and test again only with the fuel pump running pressure was still fluctuating. Few days later i tested again only with the pump running and got a steady fuel pressure but once i start the engine it's starting to get jumpy. So my conclusion is that once the system it's losing the pressure over few days or by disconnect the lines then at first start of the pump the pressure is steady but once the engine is stated the pressure will fluctuate and will do so until the fuel pressure is dropping again.
I'm thinking it might be the regulator having the orifice to small for the Walbro pump or the 10 micron fuel filter i have installed before the fuel rail. I would like to hear what you guys think it might be the problem.
Thank you!
