Cranks,no start.I sprayed starting fluid snd it Started briefly.i had codes for c position sensor A few weeks back.i pulled pos terMinal to get it running,after 3-4 times just cranks.I Replaced position sensor .no codes. Thank
U.2010 Chevy g2500 van 4.8l
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Welcome from Florida. You don't say what year or engine you have. Did you replace the sensor? Are there any codes now?

 

Thank you.noCodes
Now

 

Since it attempted to run with the starting fluid , it would suggest there is a fuel supply problem.

What you might consider, remove a plug or two and see if there is any fuel getting there, are they wet or dry?
If dry , a good place to start is ALL the fuses. If they all check out OK, then listen for the fuel pump run for 2-3 seconds when you first turn the key on. Do you hear it run?

If so, pump would seem to be working if not, you need to look further into fuel pump power and ground connections. Sometimes a good rap at the bottom of the fuel tank will allow the fuel pump to start running. This only works once. Then the fuel pump itself needs to be replaced.

 

I didnot here fuel pump when i turned key To on position..i may have Let fuel get below E Couple times

 

Fuel pump power.is my next move.

 

I have a 1998 Chevy 1500 express high rise conversion van with 5.7 moter runs great but sometimes it won't start let it sit for few hours some times a day then it will start. Only thing I have seen that happens is gas hand goes crazy and securety light stays on sounds like ant getting gas when won't stàrt but if u push the petal u can smell it. Any ideas out there

 

I'd try the easy stuff first... replace the fuel pump relay or swap it for the AC relay.

Gary