• Notice for iPhone users: DO NOT use the image size reduction option when uploading photos to the forum. This causes portrait images to post as landscape. We have added a warning to the image insert pop-up as well.

Fuel pump question

Robert Slone

Robert Slone

Legacy Registered User
City
Spring Hope
State
NC
The Scrambler died on the road friday afternoon. I was in 5th running about 72 when it sputtered and began to loose speed. I tried to excellerate but it sputtered so I went to 4th and was able to maintain 65 as long as i was very easy on the pedal. Traffic ahead of me made me hit the brakes and that was it. I figured it was the fuel pump. I've replaced it at least 2 other times in (10 years). I got it towed home and got a new fuel pump. When I pulled the hose loose from the end of the pump gas came running out from the tank end. So gas was running out of the tank and thru the filter and out the end of the hose I had disconnected between the filter and the pump. I caught about 1/2 gallon before I got the hose connected again. As I recall from the other times only about a 1/2 cup drained out from the filter and lines. What's making the gas draw out of the tank? The ignition was off. Should I have disconnected the wiring from the pump first? ( I just now thought about that :banghead:)
 
If you pull the feed line off of the pump after it has primed, it'll siphon out of the tank pretty easily. I'm surprised that it stopped at 1/2 of a gallon.
 
It didn't stop, I just stuck it back on the pump and re-clamped it. So if it's been sitting for hours that shouldn't happen? I did try to start it a few minutes before pulling the hose.
 
If it sits for a while, it will lose some of the suction in the line inside the tank at the pick-up.
 
Why don't you just take your gas cap off? That would release the suction...right?
 
hefavitzen said:
Why don't you just take your gas cap off? That would release the suction...right?
Click to expand...

It's been cold and windy so I haven't messed with it. It's been sitting for days so I hope it won't happen again. I think I will remove the cap though. I've swapped these out twice before and the only gas i lost was the little bit in the filter/lines - maybe a couple of ounces. The tank is full so draining it is not an option.
 
Be careful if you have to drop the tank! 20 gallons weights around 120 lbs!
 
I swapped the pump out yesterday. I stuck a fat pencil in the hose to stop the gas flow while I changed the pump. Only lost about a pint of gas. I actually read the directions for the pump. It states "drain the gas tank". With 20 gallons of gas that wasn't an option.

Still won't crank:banghead:. It turns over but won't crank. Any ideas on what to check next?
 
If you have fuel at the inlet, then there is not too much left. Stick a piece of hose on the outlet of the pump and have somebody watch if it pumps fuel when you crank the motor. If there is no fuel, then you might want to inspect the fuel pump lobe on the camshaft.
 
You must log in or register to reply here.
Back
Top