2005 5.3 cranks no start

I need help bad ..son was driving on highway truck died said it had code p0300and one other cant recall it now fuel pressure was low. replaced fuel pump pressure is good now replaced relay aswell noticed a bit of water in tank cleaned out tankalso ..it will run for a few seconds on starting fluid as long as you spray it have charged battery .. plugs spark but are dry what is next thanks

I need help bad ..son was driving on highway truck died said it had code p0300and one other cant recall it now fuel pressure was low. replaced fuel pump pressure is good now replaced relay aswell noticed a bit of water in tank cleaned out tankalso ..it will run for a few seconds on starting fluid as long as you spray it have charged battery .. plugs spark but are dry what is next thanks

What is cranking fuel pressure?
Does it have injector pulse ranking?
Any anti theft lights staying on?

I need help bad ..son was driving on highway truck died said it had code p0300and one other cant recall it now fuel pressure was low. replaced fuel pump pressure is good now replaced relay aswell noticed a bit of water in tank cleaned out tankalso ..it will run for a few seconds on starting fluid as long as you spray it have charged battery .. plugs spark but are dry what is next thanks

give fuel pressure details. do the fuel pressure test procedure post results .

with the fuel pressure readings/test being good then the injectors maybe damaged or dirty. this can happen with contaminated fuel. with repeated start attempts the plugs should be wet if fuel is flowing into the cylinders.

Fuel pressure at 60 but what gets me it coded p0300 not a p0301 ect so all injectors went at the same time while running at highway speed im sorry dont know about injector pulse rating and no anti theift lights are on .. i read somewhere if crank sensor was going out that it wouldnt let injectors function does that make any sence ?

Also its not showing any codes now they cleared them before it was towed home

If you have good fuel pressure, 60+, and the vehicle starts and runs as long as you spray carb cleaner into the intake(this means you are getting a crank signal), then it sounds like the injectors are not firing.....

Probably a PassLock system....this will set "B" codes, not "P" codes for the theft deterrent system...most code readers/scan tools can't read "B" codes....most likely a B2958 or B2960 is set....

Ok so how do i find this out and fix if its a b code the key lock on dash comes on then goes off thanks for reply

Thanks for the help and its still not running