Quote:
Originally Posted by Hennyhog
Hello all,
I've been trying to rectify this issue for about a month now and it is still kicking my AZZ. When driving, the motor is cutting out like loss of fuel, not running on all cylinders, and loss of power. I pull over shut it down for a minute or so then take off with no issues. It may happen 5 minutes into a cruise or 45 minutes. Here is what I've done so far.
New fuel tank (filters kept getting clogged thought I solved problem...nah)
Clear fuel filter
Changed over to HEI last week (REALLY thought I solved it this time...nope)
New plugs
I guess what I'm going to throw against the wall next is could it be a problem with the fuel pump? Can a mechanical pump fail intermittently?
Or could it be plug wire that fails/misfires intermittently? It's a 350 with a Holley 650 dbl pump if that helps.
As always love the feedback and what you guys suggest!
Henny
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YES!! I have had this happen first hand. It would only happen in city driving or at the landfill in the middle of summer. Once it died, I could kill the battery trying to start it. Once it cooled off a bit, it would fire right up. After a jump, of course.
I suspected vapor lock. With it being a nearly stock truck, I suspected something was broken. Internet research suggested a bad fan clutch. A way to test it would've been to get a reflective tachometer and a piece of reflective tape. Stick the tape to the fan, measure the fan's speed.
Block the radiator with a piece of cardboard or something, and monitor the RPM change relative to change in temps. Once I realized the cost of the reflective tachometer was more than a fan clutch, I replaced the clutch.
No improvement whatsoever. Eventually the truck died for good. It would not start under any conditions. Had to have it towed home. :-( I checked for fuel to the carburetor, it was bone dry. Replaced the pump. Have not had a single problem in quite a few years now!
But before you throw anymore part at this problem, you should consider testing your pump first. It was too late for me. If I'd considered a failing pump, I would have tested it before it failed. Check it for pressure at the outlet, vacuum at the inlet, and flow.
You may find you're getting vacuum buildup in your tank! Good Luck, and keep us posted!
Regards,
Mike