S10 Starting problem-lemme explain

Here's what happened, Vehicle just stopped working. My brother & his buddy (a certified mechanic). They replaced the blackened, goo stuffed fuel filter. then when we tried to restart we noticed something flowing from BF on the throttle body, that was gasoline, after siphoning we also removed spark 1 & found gas gushing from it as well. we lost about a gallon in that instance, and then some after that. after some brianstorming we accidentally figured out that fuel injectors need not only a blue O-ring but a small black one as well called the "lower injector O-ring". we got a kit & replaced it (all four upper & lower), serious flooding stopped. now truck won't turn, we blow about 1-3 fireballs out of the TB, with BF closed & in Flood clear (BF open) but no engine turn. I need assist in getting an idea of what could be causing this not to turn. we hooked up a computer but no codes were returned (Key on, Engine Off).

We need ideas (cheap) if possible to get this thing back on the road. My bro keeps going back to timing, wanna make sure that we exhaust everthing else first. we have spark & constant fuel.

Please help.

Drain and replace the oil before doing anything else.

we have fresh clean oil & Filter in it now.

We also tested each cyl for timing & compression. Cly 1 & 4 do not have compression. Any Ideas please post reply or PM me.

Thanks

Blown Head gasket?

BlazerLT is right, if you don't have compression either your head gasket is gone or the valves are not fully closing. I would probably say head gasket seeing as you had all that liquid gas in the cyclinders.

Liquid gas in cylinders was a result of no lower fuel inj o-ring. That has been taken care of and now upon crank we do'nt get liquid gas. Plz advise. Thanx.

Liquid gas in cylinders was a result of no lower fuel inj o-ring. That has been taken care of and now upon crank we do'nt get liquid gas. Plz advise. Thanx.

What?

you cannot compress a liquid. you need to remove all the spark plugs and get all the fuel out of the cylinders and change the oil. the bad thing is you might have bent your connecting rods which will cause low compression.

Man I am lost on what this dude is talking about???

yeah! his sentences dont make sense.