This happened a while back, and now I've finnaly gotten around to deal with it. Anyway, after driving for 45 minutes and shutting the car off I could not restart it. I stopped it and just shut it off like any other day. Then tried to move it 5 minutes later and it would not start. I noticed there was no fuel pump prime. Engine just cranks. I let it sit for about 1/2 hour then it started up again and ran fine. I drove it back home for another 45 minutes no issues. Stopped in front of the Garage and shut it off. Went to start it 5 minutes later to move it in the garage and the same thing happend. no fuel pump. the car barely ran and stumbled up the driveway. I have a Code 33 and Code 34 hard set. The Pump does not have a lot of miles on it, and it sounds fine when it's running. It never stalls out, it just won't start again if I shut it off.

 

Make sure the pump relay is powering the pump. It sounds as if the pump may be getting power through the oil pressure switch only and there isn't adequate oil pressure while cranking the hot engine.

The 33 and 34 may also be relay issues, and all of those relays are mounted in the same location. Time to check wiring?

 

Ok I went out today and did some trouble shooting. Weather is better. Anyway I have a hard code 34 set. I clear the code and it re-appears instantly upon start up. As per the Code 34 fault isolation, I disconnected the MAF and a 33 set. However I'm not entirely convinced the MAF has failed. With the car running I was able to disconnect the fuel pump relay and it stayed running. The MAF relay gets power via the fuel pump relay. Is it possible the MAF is failing due to lack of or intermittent power via the fuel pum relay? The wires are in very bad condition on that harness that plugs into the relay

 

Wow. I'm really quite disgusted at how much a MAF costs. Thats robbery

The strange thing about this is, after I unplugged the relay the car still started an ran. I understand the oil press circuit provides power after ignition but how is it starting with no relay? Wheres the fuel pressure coming from?

 

Oil pressure switch will provide power to the fuel pump when pressure reaches a certain point. Don't remember the exact number any more. This was done as a backup for the FP relay.

 

Well I solved the Code 33 and 34. There was a bent pin on the MAF sensor. I must of bent it when the original problem occured and I disconnected it. Now I never did find anything concerning the original problem. It happened the last two times I had the car out, and after 45 or so minutes. Right now it's primeing normally upon ignition. The fuel pum relay is obviously working. When I had the issue of a no start it was after I shut the car off. It never stalled out on me. It was idleing fine. When I shut it, it would not start, or if it did it was sounding like a one cylinder idle due to lack of fuel pressure. Could my relay be affected by temperature?

 

Electronics do not like heat.

Typically i've found that either the injectors are bad or the ignition module is bad in a hot no start situation.

 

The car runs fine. Untill I shut it off. Once it's off I can't start it back up untill it cools down. The ignition module has maybe 15000 Km's on it. I can drive around all day without trouble. Untill I turn it off. Then theres no pump prime and no fuel pressure at the rail. If I do get a start it's very, very unstable.

 

It sounds like there is a fuel return line problem.. when you turn your car off the fuel in the line boils and vaporizes and there is an air pocket in the line. Then when you try and start it again it fails, until the system cools down and the fuel goes back to liquid form. I think it can be fixed with a new fuel regulator? Hope this helps