Pump slowing up after it's been running awhile?
Larry Alster 91 Miata White Knight 92 Miata Silver Bullet 92 Miata Honey B 04 MSM MX-5 Whooosh 06 WRX STi Subie From: [email protected] [mailto:[email protected]] On Behalf Of Robert M Sent: Monday, August 02, 2010 6:14 PM To: [email protected] Subject: 94 FMII Cutting out at high boost/rpm Greets! My 94 FMII car (installed circa 2000, RC550's, 12psi, BBBT, original fuel pump) is cutting out under high boost/high rpm conditions. I sent a datalog to FM and Jeremy replied, "Your ATS & CTS look fine. You've got plenty of injector on-time. So, if you're leaning out I'd have a look at your fuel pressure to see if your pump is bad or filter is clogged. Should be running around 35 psi at idle & around 45 psi if you pop the vacuum hose off the regulator. In boost it raises pressure 1:1. " I finally checked the pressure today and got 35 idle/44-ish with the vac source removed. Max pressure (checked with the fuel line output blocked) was ~77psi. I did notice that the behavior doesn't start immediately, but rather appears once the car is good and warmed up. What's the next step? I probably am due for a filter, but it seems somewhat unlikely that I'd get good numbers in the garage with a clogged filter, no? All input welcome- thanks in advance!
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