1987 mercrusier 180hp wont stay running unless i pump the gas

I had a car I needed to drain the gas and I cut the gas line then purchased a connector for the cut line when I put it back together. Be very careful you don't have a fire.

get you a gallon of marval mystry oil drain your oil and filter put a little mystry oil in your old filter rinse it out put back on and oil plug too fill with mystry oil crank truck let it run for 3 min let cool of drain put in new filter and oil if problem still accelorate and oil light still stays on you might have problems with oil pump if oil light goes out and still problems accelorating try changing fuel filter if this doesn't do the job also crack you truck up (if it is carberated carb) take air fiter off carb intake pour a little mystry oil in carb very slowly while running this helps to clean deposites due this for about little at a time you will hear motor sound like choking stop let motor catch up do this for about 3-5 min then pour mysry oil in till motor dies let set for 3 min start motor them put gas treatment (STP) in gas tank this should do the job if you have furl injestion put one cup of mystry oil in gas tank and one bottle of (STP) and atleat 6-10 gal of gas. if this doesn't do the job you may need to tale the truck to a spec.

No easy way, if you can get an electric pump, or a pump attachment for a power drill. Remove the fuel line, either at the fuel filter or the fuel rail, connect the pump with a bridging piece of hose, and let the pump do the work. Refill with a couple of gallons of petrol. Vehicle might smoke a little till all traces of diesel are gone. Diesel in petrol is not as bad as petrol in diesel. As you did not run the engine very little diesel will get up to the engine. Good Luck.

Something wrong with the pickup tube on the pump.

I take it you mean it WILL crank(turnover) but wont start. Anyway, Your problem may be a lack of fuel pressure. Could be the filter is now clogged. Trapped air in fuel lines, and fuel rails. Most GM vehicles have a schrader valve on one of the fuel rails. It looks similar to a tire valve stem. You could turn the key to on, make sure you hear the pump in the tank running. It will run a few seconds to pressurize the fuel system, and run continuously after the engine starts. Using a fuel pressure gage to check pressure and depress the valve carefully to visually see if fuel or air is present. Dont position yourself to be sprayed with gas.

Most late model vehicles wont arm the ignition(spark) systems unless there is correct fuel pressure, among other things. Something you may not know is that most all fuel tanks have a reserve of 1 to 3 gallons of fuel in the tank that wont register on the gage. Putting in 1 or 2 gallons most likely is not enough to prime the system. Hope this helps.

Your problem is in the sending unit itself or the float arm. The fuel pump mounts in the sending unit lines.

If you run out of gas in this truck it will quickly destroy a fuel pump, the electric pump is located inside the gas tank, it is tiny and to do its job it uses the gasoline it is immersed in for cooling, if you run the tank below 1/8 tank level the pump is going to run hot, if you run out of gas the pumps rotor bearings get very hot and if the pump gets hot enough the rotor seizes up. Also when you run out of gas it takes more than 1 gallon to get the pump to prime again, 3 gallons minimum is the least amount. The bottom line here is that you will more than likely need to pull the fuel tank and replace the fuel pump.

Water????

You need to attach a pressure gauge to the schrader valve and measure the fuel pressure with the key on and also while running. You need to see about 40 lbs in both cases.

IS your car diesel I hope

3 things your car needs to run

GAS fuel in the engine or diesel
Air air to reach the fuel to ignite it
Spark check for spark ,
unless your diesel than spark is not needed as your engine work diffrent and produces spark by engine speed when cranking and compression of both mixes above

Last check the pump make sure its pumping fuel