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What are the symptoms of a bad fuel pump #64362 05/27/08 06:20 AM 05/27/08 06:20 AM
Joined: Jan 2003 Posts: 2,581 Rutherfordton NC B BarryBum OP Fruit Of The Loon
BarryBum OP Fruit Of The Loon B Joined: Jan 2003 Posts: 2,581 Rutherfordton NC	I am having a fuel delivery problem on my little Scamp. It seems as if its running out of fuel. When it does this, I can take the line loose at the pump suction and there is nothing there. If a pump goes bad, can it blow through the check valve and pump fuel backward?? If a pump is bad, is if sporadic? I've got a new tank, new sending unit, clean lines, new filter..........not sure what else it could be??

Re: What are the symptoms of a bad fuel pump [Re: BarryBum] #64363 05/27/08 08:56 AM 05/27/08 08:56 AM
Joined: Aug 2004 Posts: 1,047 Arizona 6 68CoronetRT super stock
68CoronetRT super stock 6 Joined: Aug 2004 Posts: 1,047 Arizona	Quote: I am having a fuel delivery problem on my little Scamp. It seems as if its running out of fuel. When it does this, I can take the line loose at the pump suction and there is nothing there. If a pump goes bad, can it blow through the check valve and pump fuel backward?? If a pump is bad, is if sporadic? I've got a new tank, new sending unit, clean lines, new filter..........not sure what else it could be?? Sounds like everything is new except the pump. Have you checked your lines for leaks?? When going bad a pump will start out losing pressure so that at WOT you will experience fuel starvation. They can work intermittently for a while but eventually it will act like a plugged fuel filter before dying all together.

Re: What are the symptoms of a bad fuel pump [Re: BarryBum] #64364 05/27/08 09:48 AM 05/27/08 09:48 AM
Joined: Dec 2004 Posts: 1,061 New Mexico D dmerc super stock
dmerc super stock D Joined: Dec 2004 Posts: 1,061 New Mexico	Run a piece of hose from the suction side of the pump to a temporary gas tank close to the pump. If the pump picks up and runs fine, you have a problem with your lines or new sending unit. Also try removing your gas cap when the trouble occurs. You may have a blocked vent. Last edited by dmerc; 05/27/08 09:50 AM.

Re: What are the symptoms of a bad fuel pump [Re: dmerc] #64365 05/27/08 10:33 AM 05/27/08 10:33 AM
Joined: Jan 2003 Posts: 2,581 Rutherfordton NC B BarryBum OP Fruit Of The Loon
BarryBum OP Fruit Of The Loon B Joined: Jan 2003 Posts: 2,581 Rutherfordton NC	speaking of blocked vent. That sending unit had a little tube that went to nowhere. Was that a vent? I have it blocked off right now cause I couldn't find a line that went to it. It still does have the vent that goes to the charcoal can though on the very top of the tank. What does that other little tube do and where does it go?

Re: What are the symptoms of a bad fuel pump [Re: BarryBum] #64366 05/27/08 06:34 PM 05/27/08 06:34 PM
Joined: Dec 2004 Posts: 1,061 New Mexico D dmerc super stock
dmerc super stock D Joined: Dec 2004 Posts: 1,061 New Mexico	Ya, that's a vent. You can use it as a return line if you have a set up that has a return line. Hope your new sending unit isn't as inaccurate as mine was.

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