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Old May 24th, 2013, 11:57 AM   #21
bigbchevy
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Sounds silly but is tank cap vented? try running with cap loose, I have had this happen on a few daily drivers, turns out cap was plugged.
the tank has a vent on it
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Old May 24th, 2013, 12:01 PM   #22
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I've heard that mounting the pump at or below the bottom of the fuel tank helps prevent cavitation and long starts.
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Old May 25th, 2013, 04:10 PM   #23
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Originally Posted by bigbchevy View Post
2- it seems to happen after im up to temp for a hour or so.
How old is the pump itself? Maybe it has become hot to many times and it is starting to lock up when hot.
Does the fuel pressure jump around at all?
Where is the regulator located?
Where is your fuel filter located?

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Originally Posted by bigbchevy View Post
6-im thinking its getting a lot of heat up by the front of the motor where the line meets the stock line
Place some 1" wire loom or old garden hose over the fuel line, loosely wrap it in tin foil 2-3 times. crinkle it a bit so it forms a bit of a gap between the rolls, loosely hold the foil on with electrical tape to make a low cost temporary heat shield and see if it makes a difference. If it helps move the fuel line or install a good heat shield.
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Old May 25th, 2013, 10:53 PM   #24
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We use a product called fire sleeve in the foundry to protect hydraulic lines from high heat from splashed or spilled iron. It is pretty amazing at heat control. What is the length of the area exposed to the heat?
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Old May 25th, 2013, 11:09 PM   #25
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you sure its not the ignition module giving you a problem. Sounds like classic ignition module systems on the 5.0L
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Old May 25th, 2013, 11:22 PM   #26
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Sounds like a possible fuel pump issue.
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