Suzuki lt50 manual

Is the spark plug black with soot?A black sooty plug will not fire most of the time.

Do a compresion test maybe no compresion or the timing is out

what engine, state engine size and country.
there can only be 3 ways, to fail.
bad engine (low compresssion, us the $20 tool at WOT and see over 170psi.
Bad spark
bad fueling.
just because spark coils (COPS?) work on other car , dont mean much.
what counts is your car , its a system.
the cops, have fast 5mS pulse when firing, you using a scope to see that?
Im so curious, why not to the time old test, use a real spark plug
attached to the COP end, spark plug shell grounded to engine metal
and crank, is spark good x4? or x6 if V6 (engine NOT STATED)
is it? then spark is good, leaving fueling.
do not touch the spark plug cranking, it can hit 100,000 volts.
I use a ground strap on the spark plug casing, hands free, or you can be hurt bad, by the spark or when you jump and cut arm backing off
on cars that flood, is it flooding?
I found my engine compression good, then found all 4 sparks fire good.
so i pull the fuel pump relay. killing fueling.
i then use "test fuel" to start engine (again, text book tests)
I use the new CRC brand of test fuel with top end oiling.
i spray it in the plenum, and it starts.
if the spark plugs are bad, (part oftune it up)
it may not start if flooded,
use WOT at the throttle (cuts fuel) and start any flooded engine.
if the spark tips are black and stink of raw fuel (wet with fuel)
that means flooding.
pull the fuel pump relay ,test fuel runs for 3 seconds. each time.
3 second spray max. each time.
if that works out, then find reason for flooding if flooding.
if not flooding, you find dry sparks.
then trouble shoot no fuel.
fuel pressure not near 30 PS?
fuel pressure too high say, 60, it will flood for ever.
there are only 3 tests.
and 4 counting wet /dry sparks.
the tests done, will put you on the correct path every time.
no guessing, no swapping parts to other cars.

It possibly could be the alternator.

Faulty fuel pressure regulator.

Sorry sport but you've fallen for the old trick of throwing things at it without diagnosing the real fault. Oil in any cylinder is not good news. Get someone with good detective skills and kit for testing head gasket leaks, water jacket problems, compression etc and go through the whole system of fuel, electrics and general settings before you spend another penny on it.

Cleaning the fuel lines by air and blows air on fuel filter. cleaning too the spark plugs will do good for your saving.

check the distributor or the mould

The oil pressure sender is a good idea.It sounds like you know what your talking about have you tried spraying a little starting fluid in the throttle body to see if it will start?do you have an injection pulse tester you will need one.if you have no injector pulse but of have spark suspect a bad quad driver in the computer.or possible oil sending unit but this usally just shuts down the pump.Good luck let me know.

Sorry the isn't a drain plug on the fuel tank. Try this go to walmart or home depot and buy a kerosene can hand pump plastic cost $3 to $6 remove the hose coming from refill to tank cut off a piece of old water hose approx.5ft insert into tank from opening insert hard plastic portion of hand pump into water hose have something large enough to contain the fuel and start pumping open valve on pump to release pressure may have to pump several times to get it flowing good do not try to **** on hose pump will work once all gone reconnect hose and refill fuel with one bottle of Lucas fuel treatment and one bottle of Marvel Mistery Oil drive it all out refill fuel again with one last bottle of Lucas fuel treatment.