18 hp briggs & stratton intek i can get it started with starting fluid replaced gas , fuel pump , fuel lines& filter and sparkplugs will not run on its own but run with starting fluid any ideas?

the additive in gas eth. causes fuel lines to break down and not deliver gas to the carb. replace fuel line.

check fuel pump, remove fuel line to carb. turn motor over, if fuel does not spurt out fuel line replace fuel pump.

float in carb may be stuck, remove bowl from carb. and check needle valve, if gummed up clean.

blow air back threw the line towards the tank you have something clogging it or you forgot to turn the fuel on

take spark plug out reconnect plug wire to plug touch bottom og plug against baremetal or bolt see if spark is present if not check coil or points

Hello! How long have you owned it? Question is directed at the carb and fuel pump...I would suggest rebuilding the carb with kit and replacing the fuel pump at the same time...see photos below...There are a couple of different fuel filters; one for a non- fuel pump (gravity feed) and one with a fuel pump...Your engine requires the fuel pump filter...dirt and varnish build up in the carb and pump especially if the wrong filter is installed...Buy a gallon of carb cleaner with the tray inside...
Guru...saailer

Genuine OEM Part - Manufacturer #808656...$18 Fuel Pump




Genuine OEM Part - Manufacturer #691035...$6 Filter




Genuine OEM Part - Manufacturer #797890...$45 Rebuild Kit


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

I would replace the sparkplug making sure it is gapped properly and put a new air filter on the engine.

If gravity feed works to the fuel line on the carburetor, then the fuel pump is bad. Repair or replace fuel pump. I am looking for fuel resistant sealant to repair fuel pump diaphragms. Has anyone tried Permatex 85420 or something else to achieve this? My application is antique and the part is no longer available at a reasonable cost.

check gas tank with light is there dirt in tank? did you change fuel filter? is there spark at the spark plug? try a 2 second spurt of starting fluid in carburetor and crank does it fire?if it does then you most likely need to clean carburetor with carburetor cleaning spray, flush fuel lines with spray and swap fuel filter.

Head gasket is blowed .Its building pressure in the crankcase seen it twice. Remove the head and check for a blowed out spot between piston and the valve side

I put a new carburator kit in a Briggs & Stratton 18 HP Twin. But did not replaced the needle nor the new seat that came with kit, because I did not know how to remove it and did not to damage it. now the gas over flows

an easy way to know that is to start engine and give it a shot of starting fluid ,if you can keep it running by this method I would replace diaphragm.