[Main NG900 & OG93 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Are you sure you are not a mechanic? Good theory>>> Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Wed, 9 Jul 2003 21:45:50 In Reply to: Re: Fuel Pump question - NG900 no start (sad smilie), Paul Nielsen, Wed, 9 Jul 2003 19:30:45 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

The engine will usually try to start when the pump have failed because of the residual pressure.

Try to have a friend as a helper cranking the car over while you get under the car and bang on the gas tank with your fist or a rubber mallet (no hard or pointy hammers).

The shock waves through the tank almost always jump start a bad pump and the car usually runs until the engine is shut off again.

You see, the fuel pump commutator is built up of several plates (about 10 or 12) that the brushes rubs against.
It's usually only two or three of the plates that gets so bad that when the fuel pump (and brushes) stops over one of those plates, it wont start again.

With a labscope and a high sensitive Amp clamp hooked to the power feed, I can see the burned spots on the pump while it is running.

Anders


posted by 66.229.132...

SWEDECAR

• Fuel Pump question - NG900 no start (sad smilie), Paul Nielsen, Wed, 9 Jul 2003 16:53:05
  • Re: Fuel Pump question - NG900 no start (sad smilie), Paul Russoto, Thu, 10 Jul 2003 10:12:59
  • Re: Fuel Pump question - NG900 no start (sad smilie), SaabScott, Thu, 10 Jul 2003 04:38:12
  • Re: Fuel Pump question - NG900 no start (sad smilie), Dean, Wed, 9 Jul 2003 17:11:24
    • Re: Fuel Pump question - NG900 no start (sad smilie), Paul Nielsen, Wed, 9 Jul 2003 19:30:45
      • Re: Fuel Pump question - NG900 no start (sad smilie), Dean, Thu, 10 Jul 2003 06:31:48
        • Dean Schmean, It's your pump not your DI, brian, Mon, 14 Jul 2003 08:44:07
      • Are you sure you are not a mechanic? Good theory>>>, SWEDECAR , Wed, 9 Jul 2003 21:45:50 <-- Viewing This Message
        • Good theory>>> - Tusind tak Anders, Paul Nielsen, Thu, 10 Jul 2003 05:23:53
          • Been there, done that..., damien, Fri, 11 Jul 2003 11:58:22
          • Doing the fuel pump in the driveway?, Derek in Durham, Thu, 10 Jul 2003 05:32:22
            • Fixed this problem last week on an Alfa for $2, ckpaden, Thu, 10 Jul 2003 07:47:05
              • Re: Fixed this problem last week on an Alfa for $2, Paul Nielsen, Thu, 10 Jul 2003 08:12:03

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• Prev by Date: First of all, make sure to take it to a competent Saab-, SWEDECAR, Wed, 9 Jul 2003 21:28:07
• Next by Date: Re: what it does., Peter W. Ogilvie, Wed, 9 Jul 2003 22:43:24
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