I mean to watch the fuel pressure when you pinch off the return line from the AFPR and see if the pressure goes way high (90+). That will tell you if the Pierburg is delivering the goods, at least at idle, and that either the AFPR or the OEM FPR is regulating the pressure when the line is not pinched. But doing this at idle doesn't tell you anything about pressure at high flow rates. Given that the engine stalls when the return line is pinched, I'd guess that the pressure is going high enough to flood the engine. ----- Original Message ----- From: Larry Alster To: 'Ray Ayala' ; 'Miata Power List' ; 'SSCOR List' Sent: Monday, July 21, 2008 6:53 AM Subject: RE: Fuel Pressure
I'm not sure what you mean by pinch off the outlet line?? Of the Pierburg?? I tried pinching the output/return line from the AFPR to see what happens to the FP but the car stalls. If I need to change the in tank pump what is the thinking as to what pump to use?? Again I'm running a Pierburg for the added FP the AFPR needs so should I just use a stock pump? 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 From: Ray Ayala [mailto:[EMAIL PROTECTED] Sent: Monday, July 21, 2008 9:52 AM To: Larry Alster; 'Miata Power List'; 'SSCOR List' Subject: Re: Fuel Pressure 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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