malcolm Posted May 25, 2017 Share Posted May 25, 2017 (edited) Porsche altererd the fuel pump design by adding a secondary pump in the fuel tank to provide enough pressure in extreme warm weather. Given we dont live in this climate has anyone deleted the secondary pump and replaced with a fuel filter as are the previous cars? The era was circa early 90s.....thx Sent from my SM-G935W8 using Tapatalk Edited May 26, 2017 by malcolm correction Quote '21 Macan GTS PDK Miami Blue/Black, 7k kms '93 928 GTS 5 speed Polar Silver/Linen, 192k kms '88 928 S4 A/T Black/Ivory, 190k kms '09 Cayenne GTS Tiptronic Nordic Gold/Black, +336k kms '88 928 S4 A/T Red/Champagne, 110k miles (US car) Link to comment
Perci Posted May 26, 2017 Share Posted May 26, 2017 I'm not sure I follow what you are after, but my understanding is all the CIS cars had the primary pump in the fuel tank (and filter). CIS typically uses a high pressure pump and returns unused fuel to the tank by a return fuel line. I don't recall a second pump in those cars. You could add a second filter, but I'm pretty sure you can not remove the in tank pump easily. Sent from my iPhone using Tapatalk Quote Perci PCA DE Instructor 2014 Cayman S 2000 Boxster S 2000 Carrera 2010 Panamera 4S 1989 928GT Link to comment
malcolm Posted May 26, 2017 Author Share Posted May 26, 2017 Not CIS but LH computer controlled fuel injection.....all countries were fitted with the external pump as OEM with the additional intank pump for hotter climes...Australia and mid East as examples before all cars for all countries were fitted with both. Sent from my SM-G935W8 using Tapatalk Quote '21 Macan GTS PDK Miami Blue/Black, 7k kms '93 928 GTS 5 speed Polar Silver/Linen, 192k kms '88 928 S4 A/T Black/Ivory, 190k kms '09 Cayenne GTS Tiptronic Nordic Gold/Black, +336k kms '88 928 S4 A/T Red/Champagne, 110k miles (US car) Link to comment
malcolm Posted June 5, 2017 Author Share Posted June 5, 2017 (edited) New main fuel filter Sent from my SM-G935W8 using Tapatalk Edited June 5, 2017 by malcolm Quote '21 Macan GTS PDK Miami Blue/Black, 7k kms '93 928 GTS 5 speed Polar Silver/Linen, 192k kms '88 928 S4 A/T Black/Ivory, 190k kms '09 Cayenne GTS Tiptronic Nordic Gold/Black, +336k kms '88 928 S4 A/T Red/Champagne, 110k miles (US car) Link to comment
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