won't start

[99Yukon4x4]

Mines doing the same thing. Ran fine, then just stopped. I actually burned up the starter trying to get it to start. Thought it was a bad Fuel Pressure Regulator, so I replaced that and the starter, and still would not start. Replaced the fuel pump again and almost wants to start, but wont start.

If anyone else has any ideas, I am all ears.

Thanks

 

[SunlitComet]

any chance your fuel filter is clogged from debris or contamination of some sort?

 

[99Yukon4x4]

any chance your fuel filter is clogged from debris or contamination of some sort?

Just replaced the fuel filter, and it was broken on the inside (extreme rattling). Put the new one in (correct flow) and goto prime the fuel system and notice fuel running down the driveway. Closer look at the fuel lines show that the steel lines (between fuel pump connection that are flex and the filter) are rotted, and I guess broke while changing the filter. I am guessing if the outer side of the line looked like that, the inside was just as bad and that is the main culprit.

 

[Ridinpsycho]

If fuel lines are getting bad they will suck air and sometimes even crush inside blocking fuel off... If you checked your fuel reg I would out on a limb and try checking throttle positioning sensor and crankshaft sensor and timing control sensor they are all pretty cheap and a good investment on changing anyways...good luck

 

[99Yukon4x4]

Well, tried using rubber fuel line and metal hose straps from pump to filter and the pressure side hose keeps blowing off. Does anyone have an idea of where I can get the steel braided line with the correct connections from the fuel tank to the steel lines going into the Fuel Spider? I am starting to get to the point of really not wanting to dump any more money into it and part it out. On the other hand, the body is in good shape, and the interior is in damn near perfect condition.

 

[retorq]

You get get them from Summit or Jegs, $$$$$$$ though, I replaced my tranny lines so I've been there. I have double jacketed line at my fuel tank to the metal line, double clamped, holds fine.

 

[Monstar_est87]

Go to the junkyard and pull the lines u need...

 

[99Yukon4x4]

Go to the junkyard and pull the lines u need...

Going to attempt that this week, and possibly next week while traveling for work.

Now, here is my new issue that hopefully I can get some input on:

With the temporary lines in place, I am getting 50psi at the fuel test port, I am getting terrific spark from all wires, and STILL no start (not even an attempt to fire). I am thinking the timing chain is the culprit now. Is there anything else that I can check/do before digging into the timing chain?

Also, the plugs were wet when pulled, and replaced with new today. I did get an occasional "pop" at the exhaust.

Thanks guys!

 

[retorq]

These are interference engines, if you snapped the timing chain the valves WILL meet he pistons. No chain = no cam spinning = no spark.

 

[99Yukon4x4]

These are interference engines, if you snapped the timing chain the valves WILL meet he pistons. No chain = no cam spinning = no spark.

Thanks for that info. Even tho I am getting spark, could the cap/rotor be a possible culprit?