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Steve Dahlberg Posted on Mar 07, 2014
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Fuel delivery 460 with carburetor,and electric pumps. why do i only have fuel pumping while engine is cranking? engine will start after bowl in carb fills but stops pumping fuel after start

  • David Dohn Mar 08, 2014

    Google- 1984 F-250 fuel pump wiring diagram. When you crank the engine to get it started battery power comes directly from the ignition switch to the fuel pump- that part of the system works OK. then when the engine is running power is supplied thru the oil pressure switch- that part is NOT working.With the key on see if you have power at the oil pressure switch- no, check the fuse. Yes- jumper the wires at switch, do you hear the fuel pump run- yes- need a oil pressure switch

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1 Answer

Marvin

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  • Ford Master 85,242 Answers
  • Posted on Mar 07, 2014
Marvin
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It is designed that way. Based on my experience you have a defective ignition starter swich, it is a common fault and the subject of many recalls for this very problem. The switch is at the botton top of the steering column

Testimonial: "thank you very much!ill try it"

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Mar 02, 2010

SOURCE: I have a 1983 Ford F250, 4X4 Reg cab with a 460 -

the filter before the carb is a fuel preasure regulator, it is probly stuck open and all your fuel is going back to the tank

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Anonymous

  • 1201 Answers
  • Posted on Sep 30, 2009

SOURCE: my 86 f250 460 engine has hard time starting; New

Check the choke in the carb, might stay stuck in the open position when engine cools down. After the engine is cold, check and see if the choke is closed, if not close it by hand, and see if that works.

Anonymous

  • 51 Answers
  • Posted on Feb 08, 2009

SOURCE: locatation of fuel pump 82 ford f-250. 460 engine

Actually, even in 1982 Ford produced fuel injected vehicles. They used electric pumps, rarther than the mechanical one r_clark is referring to. So, the question is, is it fuel injected, or is it carbureted? If it's carubureted, r_clark is correct. The timing cover is on the front of the motor as you are facing it. If you look behind the large main pulley at the bottom front of the motor you'll see an oval shaped cover. That metal oval cover is the timing chain cover. Look to the left of it, still facing the front of the engine and you should see the fuel pump if you have a carbureter. If, on the other hand you have throttle body injection, the Ford F250 uses two electric fuel pumps. One is a low pressure pump which is inside the fuel tank, the other is the high pressure pump which is mounted on the vehicle's frame. That one will normally be located just in front of the tank on the inside rail of the frame assembly. It looks like a large cylinder mounted on a bracket with wires going to it. If you see a cylinder that just has a fuel input and output line with no wires, that is an inline filter, not the pump.

Also, keep in mind if you are asking about the pump because you are not getting fuel, you might want to check to see if you have a large canister style filter down there on the frame. If that's plugged, you won't get adequate fuel!

Randy Ohler

  • 14585 Answers
  • Posted on Jun 14, 2010

SOURCE: 1991 FORD F-350 with a 460 cranks but wont start.

first hit the fuel tank with rubber mallet where you might think the pump is. it's best to do this with someone trying to start the truck. if the pump comes on, it is definitely the pump. you can also check at the relay look at the relay and it should show a diagrahm. jump the leads with the switch, not the coil, first check your fuses and check for power at the relay

Anonymous

  • 613 Answers
  • Posted on Jan 24, 2011

SOURCE: 1984 f-150 inline 6, 1

I need to ask a few questions and please do not think I am insulting you.
How much gas is in tank?
Is the gas good gas and not with water in it? Can you take any gas from the hose into a clear container and wait a minute and see if separation occurs?
Can you see gas squirt into carburetor when you pull on the accelerator cable or push the lever in on the carb? If you can see it..it is going into the intake and .most likely bad gas.
Lastly and another problem area is the fuel jet inside the carb is stuck or has an obstruction such as goo from bad gas?
This gives you some ideas on what to look for and thanks for using FixYa.

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Not getting gas to carb

It could be. Since you have a carburetor, you must have a mechanical fuel pump on the engine? Only some imports with carburetors had an electrical pump.

If your filter is in the line just before the carburetor, take the line off at the filter, then crank the engine over to see if the pump is working. Mechanical fuel pumps will pump gas when the engine is cranking or running. Use a jar or can to catch the gas. If pump is working, fuel will come out in small spurts. It's not under high pressure- carbs don't need high pressure. If no gas comes out of the line, you probably need a new fuel pump. If the pump is working, it could be the filter, but could also be the needle valve and seat at the carb's fuel inlet. Sometimes they get stuck closed and won't let gas into the carburetor.
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Car cranks but wont start

Does it have spark , pull a plug wire an hold it close to the engine , metal ! If it has spark spray carburetor cleaner in the throttle plate an see if it try's to start , if it does you have a fuel delivery problem . fuel pump , fuel pump relay , electric circuit problem GM Fuel Pump Relay Testing
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How to prime carburetor on 1988 Toyota tercel 1bbl

Normally, you wouldn't need to do this to get the engine started. If you have a mechanical fuel pump ion the engine, just cranking the engine over should cause the pump to push gas into the carburetor. And if an electric pump, it should come on with the key in on.

But to prime, pour a small amount of gas down the throat of the carb, and crank. As the engine fires and runs, the pump should begin working and pushing fuel into the carb.
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I have a 1984 ford 4604bbl motor home which seems to be losing its fuel as you drive i want to try changing the fuel filter but ive looked everywhere for it along the frame rail on drivers side and under...

I recall some old fords had a filter screwed in at the carburetor inlet. But likely somewhere around the engine bay-they didn't start putting them under the vehicles in the fuel line till later. There would be a sock or screen inside the tank on the fuel pickup pipe, but never a filter in the tank, and the screen seldom got plugged, unless dirt or trash got into the tank.
It could be your pump, too. Is it a mechanical pump on the engine, or an electric pump in the fuel line somewhere? You can take the line off at the carburetor and check fuel volume and flow, use a can to catch it . If a mechanical pump, the engine has to be cranking over for the pump to push fluid through. Also at the carburetor, check that the needle valve is letting gas into the carburetor. This needle valve is controlled by the float in the carb bowl-when gas in the bowl drops, the float opens the needle valve off a tiny seat to let fuel into the carb. Sometimes they get blocked or clogged, or can get stuck closed. A new needle valve and seat are always found in carb rebuild kits, along with all new gaskets and other wear-prone or rubber parts. Check before deciding it is the carb, if gas is getting to the carb in sufficient flow. There are specifications for fuel flow-something like a quart in 20 or 30 seconds of cranking the engine for a mechanical pump-but you would have to look for the spec for it. Generally, I think a pint of gas in a few seconds would determine if the pump was working sufficiently.
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1988 amc eagle wagon when starting cold it will not stay running. it will start back upwith several pumps of the gas pedal then stalls again when it finally gets to normal operating temp. then it idles...

It sounds like carburetor problems. Have you tried a new gas filter?
Check if the choke is operating properly-it may be open too far for a cold engine. The fuel level in the carburetor bowl may be set too low. You might also want to check volume flow from the mechanical fuel pump: disconnect gas line to carb and catch the fuel in a container as you crank the engine-watch fuel flow and volume-it should give a pint or two after half a minute of cranking, maybe less cranking time. Also check the needle valve at the inlet for carb-sometimes a tiny bit of trash or debris will clog up the needle valve. If all else fails, try a rebuild kit for the carb-those simple old carbs should be easy to rebuild.
How long since last tune-up?
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I have a 1983 f150 pickkup with a 300 6cylinder with one barrel carburetor. The problem is the carburetor gets dry and you have to pump and keep pumping to get it started. How can I correct this problem?

replace the accelerater pump (plunger) don't know if you can buy just the acc pump, but your going to need the gaskets, just get a kit, can't be that much for a one barrel, part # should be on a tag or stamped on the float bowl.
Please let me know if this solved the problem.
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Troubleshooting rochester 2gc carburetor --- I have the j-2 set up on my 1957 oldsmobile. The engine starts and runs good, after its shut down for about ten minutes it becomes hard to restart. Maybe the...

It sounds like you are experiencing a problem with the Rochester 2GC carburetor on your 1957 Oldsmobile. The issue you described, where the engine is difficult to restart after it has been shut off for a period of time, could be caused by a number of things.
Here are a few things you can try to troubleshoot the problem:
  1. Check the fuel level in the carburetor bowl. If the fuel level is too low, the engine may not start. Make sure the fuel level is at the proper level and that the bowl is not leaking.
  2. Check the float level. The float in the carburetor controls the fuel level in the bowl. If the float is set too high, it can cause the engine to flood when it is restarted. Adjust the float level according to the carburetor manufacturer's specifications.
  3. Check the fuel pump. The fuel pump supplies fuel to the carburetor. If the pump is not working properly, it could cause the engine to flood or not start at all. Test the fuel pump and replace it if necessary.
  4. Check the fuel lines. Make sure the fuel lines are not clogged or damaged. Replace any damaged or clogged fuel lines.
I hope these suggestions help! Let me know if you have any other questions.
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I have a 1983 Ford F250, 4X4 Reg cab with a 460 - V8 and an automatic transmission. This truck has a single mid mounted fuel tank. There are approx 66,000 miles on this truck. When this truck sits...

If the fuel is the problem,then the carburetor is loosing it`s prime,I would find out why the fuel,is leaving the fuel bowls in the carburetor.
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1988 F-250 460 engine stalls when dribing down the road

On older, carbureted engines, cold stalling (and hard starting) is most often due to an automatic choke that is sticking, misadjusted or broken. Cleaning the choke mechanism with aerosol carburetor cleaner may free up the choke allowing it to work properly again. If the choke housing as an electrical heating element, the element may not be receiving voltage when the key is on, or the element may have burned out (check resistance with an ohmmeter).

Other causes of stalling with a carburetor include an idle speed adjustment screw that is set too low (turn screw to increase idle speed rpm). The engine may stall if the idle fuel mixture screw(s) are not adjusted correctly or the idle mixture port(s) are dirty or clogged with fuel varnish deposits (clean the carburetor and readjust the idle mixture screws for smoothest idle). Stalling can also occur is there are vacuum leaks in the carburetor, under the carburetor (bad base gasket), or any vacuum hose connections to the carburetor or intake manifold
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