Wont start 1995 bmw 525. just stopped on me pushed out of road day later it started and ran fine for 15 min. now it wont start unless it sits for a few days and is cool outside. when it starts last few min. not sur if its fuel or fire how do you check?

Check fuel pressure at the injector rail. Could be your fuel pump relay is cutting out. If fuel pressure is good, check for sparks at the plug wires. Read the link below for more info.
Do It Yourself Diagnosis and Repair

before you do anything check you fuel line at the engine and see if you are getting fuel. sounds like its not getting any fuel.

Have you checked fuel pressure before and after cranking the engine ? ?

replace ignition coil

sounds to me like you have a short in the ignition itself , it seems intermittent which would make me believe its the ignition

try my favorite simple fix. Get some stp fuel treatment or whatever is common for your area, read the label and make sure it removes water from the gas tank/gas pour the entire bottle in then fill up the tank. let the car run for a few minutes drive it if possible. Your problem should clear up shortly.

CHECK ALL OF YOUR COIL PACKS,YOU MIGHT HAVE TO REPLACE THEM.

Check the gas it could be contaminated, Not to sould like a Wise guy but are you sude it 's not deisel fuel you put in.

replace fuel pump and relay.

the alarm is activating when he locks it and for some reason the key or fob isnt deactivating it..check the disarm switches in the door