The tank pump will obstruct flow if it's not running. There's also a sock filter on its pickup. A quickie test for the Pierburg is to momentarily pinch off its outlet line. ----- Original Message ----- From: Larry Alster To: 'Miata Power List' ; 'SSCOR List' Sent: Monday, July 21, 2008 6:19 AM Subject: Fuel Pressure
The car 1992 1.6 engine/JR supercharger running 6 psi/Pierburg Pump/BEGI AFPR (old style) car has 150,000 miles on it and the Sebring system has been on it for about 35k. The problem is that I don't develop enough fuel pressure. Was running about 75-80 psi in the past. Now I can't get more than 65 and it doesn't hold that. No WB but the NB unit never shows the A/F going full rich anymore. Changed the fuel filter. Made sure the Pierburg is running. Could the tank pump be bad and the Pierburg isn't capable of overcoming the load of a bad tank pump?? Or could the problem just be the AFPR?? I turned the adjustment screw a little and got no real difference in the pressures. I hate to mess with the setting on it since the car was running well and the thing is a PITA to adjust. Larry White Knight 1991 Crystal White #99 CSP Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo Honey B 1992 Sunburst Yellow #99 SM2L JR Supercharger Whooosh 2004 Titanium Mazdaspeed MX-5 LowCountry Miata http://www.lowcountrymiataclub.net Masters Miata RAGS 074 ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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