slownrusty Posted October 18, 2008 Share Posted October 18, 2008 Guys - I installed a Walbro 255lph High Pressure (GSL-392) in my car ('83 ZXT) about 5years ago. Of those 5 years the last 2 years, the car sat in my garage as I rebuilt the engine. The fuel pump has less than 5,000 miles on it. So I completed my engine rebuild recently (as most of you know), and 2 weeks ago the car ran incredible lots of power and took it for a great 20mile drive no problems. Fast forward to yesterday, went to drive the car and it starts perfectly and idles great! It will even rev all through the rpm band *ONLY* in neutral, however when I put the car in gear and start to drive right at about 2,500rpms the car falls F-L-A-T on its face...no matter the gear, its like there is a chain on the back bumper connected to a Mack Truck going the other way. If I let off the throttle the car will idle fine and rev fine, but under load, I just cannot get it to rev past 2500rpms... Fuel filter is clean and I am running an Aeromotive FPR which is working as it jumps about 5psi in fuel pressure when I pull the vacuum line off it. Really weird and scratching my head on this one. Do you think its a problem with my Walbro? Thanks! Regards- Yasin Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted October 18, 2008 Share Posted October 18, 2008 You have any way to monitor your fuel pressure under load? I suspect the pump isnt the problem. Is that filter clogged? Quote Link to comment Share on other sites More sharing options...
hughdogz Posted October 18, 2008 Share Posted October 18, 2008 Hi Yasin, I don't know if this is the cause of the issue, but I couldn't get above ~4500 RPM due to a clogged Catylitic converter. I doubt that is your problem. You have an SDS or megasquirt? I know the OEM EFI would throw a fit at ~3500 rpms if all the ECU, etc. connections are not clean. I wish I could help some more...perhaps more experts will chime in. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted October 18, 2008 Author Share Posted October 18, 2008 Well last night I jerry rigged a fuel pressure gauge and taped it to my windshield and will take it for a drive this morning and see what it does under load - x-fingers. Hugh - I am only running a downpipe off the back of the turbo no exhaust. I also running stock OEM EFI at low boost for the initial break-in and doubletriple checked all my connections. I will report back later this morning. Thanks Regards - Yasin Quote Link to comment Share on other sites More sharing options...
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