Question about 1999 Chevrolet Tahoe

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1999tahoe shuts off after it warms up and starts back up after 3 hours?

I replaced DA fuel pump

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And I hope you replaced the filter too, :)

Off hand I would ask if any trouble codes popped up like multi-Misfire
or engine code's of P0300- P0308, "no spake at plugs or a misfire at plugs.?" You might need a ignition control modular, "MIGHT" for some reason there's usually not a code for the ICM but you would get misfires since you lose spark to the plugs..

if your ignition control modular is inside the distributor cap and you decide to have it checked auto part stores can check it out of the truck, BUT I would add a new on IF your getting codes of P0300-308 since they run hot, and if you do replace it get the heat sink grease for the bottom of it to help keep it cool, They get Really hot..

Just my thought.

Posted on Dec 09, 2014

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1 Answer

What causes engine hard to start after warm up


Bad fuel pump, fuel not shutting off when turned off and leaking into the engine.

Does it smell of gas under the hood after it sets?

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My truck wont start when it is cold, i checked the fuel pressure and it reads 52 lbs. When the truck is warm it will start everytime. Oil pressure gauge is reading low, but the dipstick reads full.


When are you taking the fuel pressure reading? After it has sat for awhile or right after you shut the truck off when you get it running? Have you tested the pressure right before you try to start it cold?

I would check the pressure right after shutting the truck off, then wait an hour and check it, and once again after another hour. If you lose fuel pressure then you either have a bad fuel pressure regulator or you have a loose fitting / cracked line or some problem that allows air in the fuel line causing the fuel to syphon back to the fuel tank.

The next time you try and start it cold, turn the key to the on position and listen for the fuel pump whine to stop, then turn the key off and repeat above step 2 or 3 more times. If it is losing pressure, then doing that will build your fuel pressure back up and it will start.

Check the pressures and report back your findings.

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The fuel pump is in the fuel tank, when was the last time the fuel filter was changed? Do that and then do a fuel pressure test. Pump could be geting weak, but does not show up until it gets warmed up, or fuel filter is dirty and restricting the flow and in conjuction with a weak fuel pump will cause it not to run.

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My 99 suburban wont start without starting fluid


I had same problem. Engine will start if you crank it for awhile. This is because the fuel pump has a . check valve that is supposed to keep fuel from running back into tank and hold fuel at pressure so it will start immediately. If valve leaks it takes awhile for fuel to be pumped back up to injectors. Replacing fuel pump fixed my problem.

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