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Old 05-30-2012, 06:33 PM   post #1 of 16
SteveG66
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Default GT275 Pulse Fuel Pump, Can't get pulses

Hey all,

Been having problems with the GT stalling, now I can't get it to start. I diagnosed a no fuel situation. It was not getting fuel to the carbureator, so I replaced the fuel pump with a new one. Still not getting fuel to the pump, even with the new FP.

I believe the pulses for the FP arent strong enough to operate the Fuel Pump. Any idea how to diagnose and what could be wrong? Is it possible it's still the fuel pump and I got a bad one? I would imagine it's possible to have a faulty fuel pump, even new. Am I just the lucky one?

Any help in diagnosing this would be very much appreciated, I am at the point I can only just sit there and look at it-which isn't helping much.

BTW: i did replace the some of the fuel lines, but it goes back to the fuel pump not doing it's job.

Thanks in advance for your help, thanks for taking the time to read this.

Steve G
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Old 05-30-2012, 07:34 PM   post #2 of 16
JRJ
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

You might want to replace the fuel line from the tank to the FP, and check the inside of the tank for any debris, also check the gas cap and make sure the vent hole is clear. Get the gas line at any out parts store (cheaper), and while your into the fuel line might as well replace the fuel filter. You do know to replace the fuel line you will need to remove the seat and the rear fender section which there isn't much to that.
See how all that goes.

Dick
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Old 05-30-2012, 08:09 PM   post #3 of 16
brianb883
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

If your crank case vent hose is clear of obstructions, I bet you are in fact getting pulses, but the pump just can't pull any fuel in.

I'd just start by going through all the lines and making sure the filter isn't clogged.
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Old 05-30-2012, 08:36 PM   post #4 of 16
Engine_Tech
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

If the piston is moving, you've got pulses.

I'd look more at cracked lines and a pickup problem in the tank.
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Old 05-30-2012, 11:42 PM   post #5 of 16
SteveG66
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

Thanks for your responses, I will replace the hose from the tank to the fuel pump including the a new filter.

Will let you know how it goes.

Thanks again,
Steve
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Old 05-31-2012, 10:27 PM   post #6 of 16
SteveG66
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

Well guys,
5 feet of hose, new filter and still no go. I cant figure it out, I just cant get it to suck the fuel into the carburetor. Even when I take the fuel cap off.

Now what?

Any help or suggestions would be appreciated,
SteveG
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Old 06-01-2012, 12:02 AM   post #7 of 16
69project
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

Does this have a carb on it? I had a Kohler engine on my chipper that seemed to have a similar problem. It would not start at all but ran once I through some gas in the carb. My issue was there was a anti-dieseling solenoid in the carb that became gummed up with old gas. Once I cleaned it everything worked.

There is also a troubleshooting section in the other part of the forum. I posted my issue discussed above there and someone with a whole lot of small engine knowledge jumped right on it and helped me out. He wasn't a JD person but certainly knew his small engines.
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Old 06-01-2012, 08:55 AM   post #8 of 16
SteveG66
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

Hey 69,

Thanks, it does have a carb on it. I think I'm gonna try to exchange the new FP for another new FP and see how it goes.

I will also head over to the troubleshooting section, great idea!!!
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Old 06-01-2012, 01:57 PM   post #9 of 16
brianb883
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

I had a similar issue, but when I pulled my fuel line from the pump to the carb there was pressure. for me it turned out to be a clogged little jet in the carb that prevented the entire engine from running.
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Old 06-02-2012, 01:23 PM   post #10 of 16
SteveG66
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

Well, I primed the fuel line from pump to carb, full filter and was able to run engine until fuel bowl and line were emptied. I pressurized the tank, by blowing into the tank with a pretty good seal from my face , and still did not help.

Has anyone looked at the reed valve that they have? is it hard to get to? Is it something that I can do?

Any help is appreciated.

Dealership is going to pick it up early next week, would like to be able to call and cancel, my labor is cheaper than theirs!!!!

Thanks again,
Steve
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Old 06-02-2012, 01:26 PM   post #11 of 16
SteveG66
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

BTW- How do you remove the hood on these things? I have one side the hinge is busted, how do I get the other side off?

Thanks
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Old 06-02-2012, 02:04 PM   post #12 of 16
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

I would just replace it with 12 vdc electric pump like this one....
Napa part number 610-1052.

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Old 06-02-2012, 02:14 PM   post #13 of 16
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

Hood Removal per the book:
1. Raise hood.
2. Diconnect wiring connector.
3. Remove cap screws on both sides, 2 per sides.
4. Remove hood.

Dick
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Old 06-04-2012, 05:38 PM   post #14 of 16
SteveG66
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

All,

Thank you for your help, I got it running!!!

I can officially declare myself as a contender for the Dumb A@# award: I had the fuel line and vacuum line crossed. I can safely tell you that this pump will absolutely positively not work when they are crossed despite the barrage of cuss words thrown at it.

I was also able to remove the hood compliments to the suggestions from this forum.

Thanks again all, I truly appreciate the time you took to coach me through this, I learned to not jump to conclusions when repairs don't go as expected.

Thanks again and all be safe,
Steve
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Old 06-04-2012, 06:46 PM   post #15 of 16
69project
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Default Re: GT275 Pulse Fuel Pump, Can't get pulses

That's ok, I once crossed a vacuum line and very small coolant line on a fuel injection system(who the **** runs coolant through a throttle body, apparently those manufacturers concerned about emissions) on a Toytota Tercel once. Couldn't figure out why it blew white smoke out the tail pipe. I thought it was a bad head or head gasket, which I had just replaced. I figured it out after a day or so but it took about 40 minutes of running the engine to get all of the coolant burnt out of the cat once I did.

Learning patience while doing trouble shooting is a rare talent and most folks end up tossing out perfectly good equipment as a result of not having patience.
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