Diagnosing crank no start. Need advice to fully drain all fuel from tank and lines
11-09-2010, 03:56 PM
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Diagnosing crank no start. Need advice to fully drain all fuel from tank and lines
Can someone please give me some advice on how I should go about draining all the fuel out of the tank and fuel lines? I searched and found nothing on this topic.
I am having a starting issue and this is the next step I want to take to find the culprit. There is about a half tank in there. The fuel has been sitting in the tank for several months so my guess is that its no good now, and that is why it will not fire. I just recently finished putting my engine back in after having a rebuild/seal upgrade so its kind of a mystery as to why it wont fire. (it cranks normally, no start)
Before I took the engine out I had it at a dealership, they confirmed my suspicion of low compression (blown apex seal), and said it had an ignition issue (gave me no specifics on this), so I had it rebuilt and I installed the BHR coil system to fix the ignition problem. Yet still it wont start.
I am using the COBB AP with MM forced induction base calibrations. I suppose there could be a timing issue BUT I am unsure how to do timing.. Please HELP!
I am having a starting issue and this is the next step I want to take to find the culprit. There is about a half tank in there. The fuel has been sitting in the tank for several months so my guess is that its no good now, and that is why it will not fire. I just recently finished putting my engine back in after having a rebuild/seal upgrade so its kind of a mystery as to why it wont fire. (it cranks normally, no start)
Before I took the engine out I had it at a dealership, they confirmed my suspicion of low compression (blown apex seal), and said it had an ignition issue (gave me no specifics on this), so I had it rebuilt and I installed the BHR coil system to fix the ignition problem. Yet still it wont start.
I am using the COBB AP with MM forced induction base calibrations. I suppose there could be a timing issue BUT I am unsure how to do timing.. Please HELP!
11-09-2010, 05:36 PM
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Are you FI?
Do you have spark?
Are you getting fuel to the injectors?
Are your injectors squirting fuel?
I think you have more to diagnose before jumping to draining fuel out of the tank.
Go back to either the stock map or a base NA MM map until you get it started. Before draining the tank, check all of your grounds, fuses, and wiring. Make sure your fuel pump has power and is working. Check all of your injectors and connections. Be sure you haven't crossed any of them. I doubt thT it would be bad fuel after only several months. Even bad fuel would sputter at least.
Do you have spark?
Are you getting fuel to the injectors?
Are your injectors squirting fuel?
I think you have more to diagnose before jumping to draining fuel out of the tank.
Go back to either the stock map or a base NA MM map until you get it started. Before draining the tank, check all of your grounds, fuses, and wiring. Make sure your fuel pump has power and is working. Check all of your injectors and connections. Be sure you haven't crossed any of them. I doubt thT it would be bad fuel after only several months. Even bad fuel would sputter at least.
Last edited by fuztupnz; 11-09-2010 at 05:42 PM.
11-10-2010, 05:18 PM
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Are you FI?
Do you have spark?
Are you getting fuel to the injectors?
Are your injectors squirting fuel?
I think you have more to diagnose before jumping to draining fuel out of the tank.
Go back to either the stock map or a base NA MM map until you get it started. Before draining the tank, check all of your grounds, fuses, and wiring. Make sure your fuel pump has power and is working. Check all of your injectors and connections. Be sure you haven't crossed any of them. I doubt thT it would be bad fuel after only several months. Even bad fuel would sputter at least.
Do you have spark?
Are you getting fuel to the injectors?
Are your injectors squirting fuel?
I think you have more to diagnose before jumping to draining fuel out of the tank.
Go back to either the stock map or a base NA MM map until you get it started. Before draining the tank, check all of your grounds, fuses, and wiring. Make sure your fuel pump has power and is working. Check all of your injectors and connections. Be sure you haven't crossed any of them. I doubt thT it would be bad fuel after only several months. Even bad fuel would sputter at least.
I will go back and check those little things like grounds, connectors, etc.
How would you check for spark? I've been told to crank it with a spark plug out and a screw driver between it and the block but that seems like it would be bad for the engine. I'm almost sure it's getting fuel, the flexible line leading to fuel pressure sensor is firm now like there's fuel being pumped.
I will post again after I have a chance to get back to work on it.
11-13-2010, 11:01 AM
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I know of at least one local who would flood if he left his car alone for 3 weeks. There was a problem with the fuel injectors slowly dripping while the car sits on the 04's. I would just go with the deflood process that Jon has out in the DIY.
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