E34/535 No start

[Rus]

A faulty injector can leak when the engine is off and let down the pressure. This could lead to a delayed start later as well as some black smoke from having the engine flooded with fuel.

[DABLACK]

A faulty injector can leak when the engine is off and let down the pressure. This could lead to a delayed start later as well as some black smoke from having the engine flooded with fuel.

Rus, thank for your help by the way much appreciated. There was no black smoke...im miffed...

[nirvana19]

Could be the fuel pump or the fuel pump relay

[DABLACK]

Could be the fuel pump or the fuel pump relay

does anyone have the part # for the fuel pump relay

[ahlem]

I'd try turning the ignition from off to fully energized but not far enough to crank several times at about 3 second intervals then try to start the car. I believe the fuel pump kicks in for about 2 seconds then shuts down. If you do it a couple times, you build fuel pressure. If it starts right up once you do this you have verified that the relay works OK and something is letting down fuel pressure when it sits. You can have a helper do the on-off manuever while you listen in the trunk for the two second fuel pump run. Cheap and painless check.

[DABLACK]

I'd try turning the ignition from off to fully energized but not far enough to crank several times at about 3 second intervals then try to start the car. I believe the fuel pump kicks in for about 2 seconds then shuts down. If you do it a couple times, you build fuel pressure. If it starts right up once you do this you have verified that the relay works OK and something is letting down fuel pressure when it sits. You can have a helper do the on-off manuever while you listen in the trunk for the two second fuel pump run. Cheap and painless check.

This is the technique I used when it was getting hard to start on very cold days after a while(turn the key 2 or 3 times to get pressure and it would start) then i installed the check valve and regulator and like i said now nuttin doin it wont start

[DABLACK]

This is the technique I used when it was getting hard to start on very cold days after a while(turn the key 2 or 3 times to get pressure and it would start) then i installed the check valve and regulator and like i said now nuttin doin it wont start

Well boys, I talked to my bro who was a Bimmer & Volvo tech he suggested all the same things you guys did but last night he said "as a shot in the dark I should pinch off the retun hose at the regulator and try to start it" i did this this morning and VOILA after a sputter and choke the son ova b**** started.
Any thoughts gentleman...now im wondering if im missing somthing. I read an earlier post that he installed the check valve as well and he didnt get his e34 going until 1-3 days later and hasn't looked back...but that still seemed odd
am i being too skeptical.....