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Briggs v-twin wont stay running

#1

M

martinj

Only on almost full choke, no power. New fuel filter and air filter. Pulled fuel line and cranked, it trickled out. What is norman flow?

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#2

R

Rivets

You will have to give us a lot more information before we can provide you any help. We hate making guesses when we don’t have good information. Please provide us with the following.
1. We need all engine numbers, model, type and code.
2. How long has this been going on?
3. Has the unit been sitting for an extended period of time?
4. Has anyone tried to fix the problem. If so what did they do?
5. When was the last time the engine was serviced?
6. What are your mechanical skills?
7. Have you removed the fuel line at the tank to check fuel flow there?
8. Have you check for debris in the tank, blocking fuel flow?

When we get this info, we will have a better idea how to proceed. You need to help us before we can help you.


#3

M

martinj

It was running fine. Sat for 3 weeks. No one but me has worked on it.

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#4

R

Rivets

Boy I didn’t think these were hard questions, but you only answered two of them and that doesn’t offer me a lot of help. Can you answer them all in more depth? If not I can’t be of much help.


#5

Tiger Small Engine

Tiger Small Engine

Rivets said:
Boy I didn’t think these were hard questions, but you only answered two of them and that doesn’t offer me a lot of help. Can you answer them all in more depth? If not I can’t be of much help.
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If you are saying that fuel trickled out of fuel pump with line removed going to carburetor, when you cranked engine, then you need a new fuel pump. Fuel should shoot out with a nice steady pulse.


#6

R

Rivets

Only if your fuel line is not blocked.


#7

S

slomo

And there is fuel in the tank. Just saying........ :D


#8

A

Auto Doc's

Sounds like fuel can trash blocking the tank nipple or the inner rubber of the fuel cap is coming apart and is now got bits of it in the tank. If you have to run it with the choke on, there is a fuel starvation issue.


#9

C

common sence

Rivets said:
You will have to give us a lot more information before we can provide you any help. We hate making guesses when we don’t have good information. Please provide us with the following.
1. We need all engine numbers, model, type and code.
2. How long has this been going on?
3. Has the unit been sitting for an extended period of time?
4. Has anyone tried to fix the problem. If so what did they do?
5. When was the last time the engine was serviced?
6. What are your mechanical skills?
7. Have you removed the fuel line at the tank to check fuel flow there?
8. Have you check for debris in the tank, blocking fuel flow?

When we get this info, we will have a better idea how to proceed. You need to help us before we can help you.
Click to expand...
Tmi


#10

C

common sence

martinj said:
Only on almost full choke, no power. New fuel filter and air filter. Pulled fuel line and cranked, it trickled out. What is norman flow?
Click to expand...
Could be water in bowl. Do simple test first. Take carb bowl off dump it and wipe it out. Put back on and try again. Just a couple drop of water can cause this to happen.


#11

F

Freddie21

Don't jump in and start replacing parts until problem is isloated. As the Guys have suggested, get good flow from the tank at the pump 1st. Inside the tank is where many problems lie. Fuel line from it to the pump, next. Wait on replacing filter till you get good flow. Now the pump. Are all lines in good shape and not leaking, even, air? If good, check pump output. Should give a good stream when cranking. Last, the carb. Remove bowl, if easily done, or carb to clean bowl, needle, seat and jets. You could start here, but if the flow to the carb is not right, then you'll be back at step #1. Reassemble with new gaskets, in-line shut off and filter.


#12

Etbrown44

Etbrown44

Once you verify fuel flow, if it still not right, I would invest in a $15 amazon carb. I know some guys here don't like them, but I've not had a single one fail in the past 15 years. No doubt you might sometimes get a bad one. Still worth a try.


#13

F

Freddie21

50\50% for the cheap carbs for me. At least, a cheap trouble shooting tool. I also will use them for the internal parts to rebuild OEM ones.

Just cuz the fuel lines look good, doesn't mean they are. They can close up internally just like your arteries.


#14

T

thigg001

martinj said:
Only on almost full choke, no power. New fuel filter and air filter. Pulled fuel line and cranked, it trickled out. What is norman flow?
Click to expand...
Briggs v-twin known for dropping push rods, not an expensive fix, but a pain.


#15

O

outdoorpowermike

Test fuel pump with vac gauge/fuel pressure gauge, remove inlet fuel line and outlet fuel line from fuel pump, should have 1-11/2 psi coming out of pump and about the same going into pump but negative reading. If good check vav hose going to fuel pump is not cracked and tight. If these are good check fuel hose coming from tank has good flow, if very little flow take gas cap off and see if flow changes, if still slow clean nipple at tank if gas tank is located under the hood. Look for grass or stuff clogging nipple. If no fuel filter is inline carb will get clogged at inlet and at main jet.


#16

D

davis2

slomo said:
And there is fuel in the tank. Just saying........ :D
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I've seen people not catch that before. Valid comment! 😂


#17

D

davis2

Auto Doc's said:
Sounds like fuel can trash blocking the tank nipple or the inner rubber of the fuel cap is coming apart and is now got bits of it in the tank. If you have to run it with the choke on, there is a fuel starvation issue.
Click to expand...
This happened to my old Sabre


#18

S

slomo

Auto Doc's said:
Sounds like fuel can trash blocking the tank nipple
Click to expand...
Yes this is a big deal with those that have the old style fuel cans. Most of the spouts are uncovered letting all kinds of debris into the can. Just gets passed to the carb jets and the like. Then you get a no-start condition.

You can buy a new style spout for your old can. Only a couple bucks. I "think" it keeps the fuel fresher. Not to mention water/humidity incursion.


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