See my Cave,
700 TBI⚠️ 700 TBI regulator is know to fail and leak. Mostly when true, leaks, flows on air cleaner mount area then suck into the engine.
If that leaks, get a Rebuild Kit Not just a Regulator part. Kit has same piece and likely need other gaskets.
TBI gets hit when dog bone is bad or hardware gets loose and bottom, middle or both gaskets won't seal.
If Fuel lines are damage, Anything block return line will cause problem. High system pressure or even destroy the PF because FP needs constant fuel flow to stay cool and lubed.
Iffy O2 sensor, Leaking reg or High Pressure can make engine Running Rich and maybe set Codes. Before replacing O2, check/fix ground bolted to engine. Tan "ground" is actually a return wire for "1 wire" O2.
You can't tell just by looking are TBI.
Only may tell if is leaking a O-ring etc because will have fuel dripping/spraying when ECM turn on FP to prime the system w/o actually starting the engine.
If ECM is "bad" often won't turn on the injector. But driver "chip" or wiring can fail and keep injector on. Or Injector is sticking and allowing more flow. Both can allow flow after shutdown. May not flow until engine is running.
If Intake Manifold and/or Gasket leaks then often Engine Coolant coolant is Leaking and often suck into #4 cyl. #4 spark plug often will be Cleaner then others.
If true, use only Felpro gasket that's make to prevent this problem.
Can leak w/o coolant leak but use the Felpro gasket.
If Piston Rings etc have problems... whole different thing and may need a rebuild.
But If Oil doesn't drain right from upper engine... could be just block drains. That will make oil "leak" thru valve guides because upper head had too much oil.
Plug drains are common w/ people using RTV Silicone and "boogers" get loose and plug them.
Felpro makes a better gasket, VS50179T, that Doesn't need any sealer. If cover is wrecked, buy DORMAN 264905 that comes w/ a new screw fill cap.
The fuel injector is located within a throttle body. There's no carburetor.
