Auryan

Fuel pump number 3 did the trick! 2nd one has rust inside it??????? brand new less than 300 miles on it. Had the fuel tank drained just in case but just fuel. Thank you for all the help!

Picked up an injection system pressure gauge today. Hoping to see 4.4 bar but have nothing..... looks like fuel pump number 3 on the way.

Good idea! Not sure anyone addressed that. Thanks

pressure was low prior to the dealer replacing the first two fuel pumps. I paid for one they paid for the second. Have not been able to check other than pressing the passenger side rail check valve post starting attempt. Rail is not holding pressure (if it is supposed to) just seconds after attempt. If I pour fuel into the intake the engine briefly makes an attempt to start but quits immediately. Going to replace battery (reads 12.19 volts w/ no load) just in case.

someone else suggested pulling one of the injector connections to reduce the amount of current on the rail, supposedly should start if the fuel regulator is questionable. Didn't make any difference. Checking pressure again on rail......

Well the saga continues...... fuel pump was replaced and ran great for about 2 weeks and would not start again. Engine turned over and over and over but no go. Towed car back to dealership and they replaced the fuel pump again and it started again.....left the car there for 10 days and low and behold the 7th time the dealer when to start the car it wouldnt. They then hooked the car up like it had just gone through open heart surgery and decided to replace the fuel system module. We even checked the alcohol level of the fuel in the tank just in case (under 6% alcohol) battery tests out OK too. The car ran great for about two weeks then sat for about two weeks and will not start again....round three. Dealer is stumped even had Porsche on the phone. Summer is almost over and I would be very receptive to any ideas?

Not exactly sure where fuel lines run. Pretty sure I can here the fuel pump start but......not positive. Fuel pump relay feels like it "clicks".

Is there a really good way to check fuel pressure or just disconnect the feed at the intake?

Thanks,

cel scan showed no errors today. Though for sure it would..... seems to have no spark. even took starting fluid and sprayed directly into intake. could smell it come through tail pipes....

My C4 has a tiptronic trans for the push start idea. Would like to be able and omit the starter. Great idea though! May have to just flat bed it to dealer 80 miles away...bummer.

thanks M will give those a try. have access to a cel tomorrow hopefully something shows. Battery is from 2007 cranks strong and shows 12v but no more

mark

also checked every fuse in the block, not sure how to check the big relays in the block above and to the right of the fuze block???

battery seems good, interior lights, head lights go on and top even goes up and down. engine turns over and over and over but just will not fire up

My 2003 996 C4 Cab has been running great. Car sat for about three weeks and now turns over, dash lights all go on but will not start. I did replace the fuel pump relay per a recommendation but had no effect. Almost seems to be electronically immobilized though the key remotely opens and locks car. Open for suggestions.