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Re: 91 900T no start (longish) Posted by SWEDECAR [Email] ![]() ![]() ![]() In Reply to: 91 900T no start (longish), Jhay77, Sun, 28 Sep 2003 06:24:17 Members do not see ads below this line. - Help Keep This Site Online - Signup |
With the pump still in the car, have someone cranking over the engine while you tap on the pump with a small plastic hammer.
If the pump starts, you have two bad pumps.
When fuel pumps goes bad they develop burned spots on the commutator, and whe the brushes ends up right over those spots, the pump needs to be jerked a little to get going.
That's probably why the pump starts when you take it out and hot wire it.
When you measure voltage at pump, do you use power and ground wire to pump hooked up to volt meter or only power wire and a second body ground somewhere in the trunk?
A full volt drop is quite a bit to loose, but it's important that you use a good ground source for your volt meter too.
It might not be the voltage signal that is dropping through the car but a bad body ground somewhere.
Anders
posted by 66.229.132...
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