Question about 1998 Chevrolet Tahoe

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My tahoe willonly start in the morning if I prime carb & now not at all

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The first thing you need to check is fuel pressure with a fuel pressure gauge. You need a minimum of 56 PSI (preferable a lot more) for the vehicle to start.

If fuel pressure is low than the pump is usually the problem.

The CPI injection has poppet valves that deliver the fuel to the back of the intake valves. The poppets require the minimum fuel pressure to open. If the pressure is off by less than a couple of pounds the poppets will not open.

Priming to get the vehicle started and then the vehicle continues to run is a classic symptom for this problem. Since the poppets are under vacuum with the engine running they require less pressure to open.

Posted on Oct 01, 2010

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with a vehicle this old one or more of the rubber fuel hoses may have cracks in it causing air to be pulled in and losing its prime to the carburetor. also the pump may be worn out inside causing this problem. the carburetor has a accelerator pump on it that may be worn and this is why you have to prime it to get it going. have you done a fuel filter in a while? hope this gets you started

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you may have an air leak in the petrol line, probably where the fuel pump was changed.
the car won't srpay out petrol some time's but overnight the vacum in the fuel line ****'s air in & the system is not primed.
The only way you can check this is by priming the rail first thing in the morning by turning the ignition key to the point just before starting & you should hear the fuel pump run for about 4 second's then turn off the ignotion, wait for a few sec's & turn the key to same position, it will prime again.
Do that a few times & check for petrol leak's as the fuel will run back to the tank via a pressure valve, If you see a leak then you've found where the air is getting back in if there is no leaking but the engine start's then you will have to go over all the hose clip's in the petrol system.
If not that then get back to me !

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Could this be a cold start problem


defective fuel pump the check valve is allowing it to lose prime replace fuel pump.

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I have96 blazer will start and run if i prime carb with gas but


did you also replace the fuel filter with the pump?

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