ScrubyMcBubble
Probationary Member
- 18
- 7
- Apr 25, 2013
-
Winnipeg,
MB_Canada
Hello everyone! I need your guidance and opinions. Swear ive googled to the moon an back on this one and found nothing here or there.
I'm boost testing my 95 GST and found that my FIC 1200 Hi-Z's are leaking in the middle. Not on the seats or the fuel rail but right in the middle close to where the wires connect. Short videos attached for the TL;DR
To explain further i start by turning the key for the fuel pump to kick in and pressurize the rail, pinch the vacuum line for the MBPR, pump 20 - 25 psi of pressure from my air compressor into the turbo inlet. Spray everything down with soapy water and found no notable leaks except for bubbles from all 4 of my injectors in similar places, and also from the OEM Fuel pressure regulator.
When supplying FIC with the videos they were very quick to send me another set under warranty (Awesome support from this vendor!). After installing the new set they have near identical symptoms however the leaks are slower and more subtle. The previous owner has stated it has a walbro 255 fuel pump (certainly whines like one) but it only has the OEM Fuel pressure regulator so im thinking my next steps should be to get a FuelLab or Aeromotive AFPR and new lines.
Something about this still doesnt seem right to me and i still can't explain why i have these symptoms. If air can leak from the injectors, would fuel not leak from them too (especially at 43.5psi)?? Could this be caused from a failed diaphragm in the oem FPR?
More car context: It came tuned on a piggyback SAFCII with 550's, i have since swapped for 1200 FIC Hi-Z's with ECMlink and added a fresh wideband. I went as far as tuning idle on speed density before taking a step back to make sure there wasn't anything missing that could cause me to have to tune it all over again.. So im looking at the basics first before proceeding with anymore tuning. I saw no signs of fuel leaks and smell no gas when i was tuning idle.
Only had this one for 2 years so its a work in progress.
I'm boost testing my 95 GST and found that my FIC 1200 Hi-Z's are leaking in the middle. Not on the seats or the fuel rail but right in the middle close to where the wires connect. Short videos attached for the TL;DR
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To explain further i start by turning the key for the fuel pump to kick in and pressurize the rail, pinch the vacuum line for the MBPR, pump 20 - 25 psi of pressure from my air compressor into the turbo inlet. Spray everything down with soapy water and found no notable leaks except for bubbles from all 4 of my injectors in similar places, and also from the OEM Fuel pressure regulator.
When supplying FIC with the videos they were very quick to send me another set under warranty (Awesome support from this vendor!). After installing the new set they have near identical symptoms however the leaks are slower and more subtle. The previous owner has stated it has a walbro 255 fuel pump (certainly whines like one) but it only has the OEM Fuel pressure regulator so im thinking my next steps should be to get a FuelLab or Aeromotive AFPR and new lines.
Something about this still doesnt seem right to me and i still can't explain why i have these symptoms. If air can leak from the injectors, would fuel not leak from them too (especially at 43.5psi)?? Could this be caused from a failed diaphragm in the oem FPR?
More car context: It came tuned on a piggyback SAFCII with 550's, i have since swapped for 1200 FIC Hi-Z's with ECMlink and added a fresh wideband. I went as far as tuning idle on speed density before taking a step back to make sure there wasn't anything missing that could cause me to have to tune it all over again.. So im looking at the basics first before proceeding with anymore tuning. I saw no signs of fuel leaks and smell no gas when i was tuning idle.
Only had this one for 2 years so its a work in progress.