VFKR dirty tank? Bad gas? Help! I wanna ride!

Well, I removed the in line filter (hoping that would be the issue) but alas, it did the same thing so, now, as ToeCutter explained, the carbs will be coming off. Thanks for the link Toe. I'll be following it step by step.

Let you all know how it turns out.

 

Posted earlier that the pump no work and yes, I tested it. I put on a new pump and I got the same problem.

I pulled the carbs, everything is clean as a whistle. Including the little screens, no dirt or nothing. Putting the carbs back on now. Looks like it's back to square one.

Any more suggestions?

 

Did you test both pumps directly from a 12v battery? If you mean "with power" on the bike turning on the key. Then that's not what I meant. I mean a stand alone source from the bike's wiring/relays. Directly off the battey. Double check the grounds at the pump.


"Posted earlier that the pump no work and yes, I tested it. I put on a new pump and I got the same problem."

Then it's either your wiring harness, connectors(dirty), ground or fuel pump relay. Just hook the pumps up to a battery by themselves to see if they work or not. The reasoning is the new pump should work either directly to the battery or thru the bikes wiring if JUST the first pump was bad.

The fuel pump kicks on every time the coils fire. That's where the fuel relay gets it's trigger to turn the pump on/off. If your bike is not running then the pump is not either. So just having the ignition on will not allow the pump to turn on.

 

Sorry, let me clarify. I originally tested the stock fuel pump on a seperate 12v power source and it did not work. I went to gravity feed and that worked until the sputtering issue came up. I then went and purchased a small 2-3 psi fuel pump and hooked it up to the bike thinking the gravity feed wasn't working. This pump was/is working as it should (pumped fuel from the tank to the fuel filter.

Problem continued with pump and with gravity feed.

Next, I removed the pump and rehooked up the gravity feed and watched the fuel filter while bike was running. The filter would fill initially, I'd start the bike and watch. As fuel left the filter I could see it fogg slightly and would not refill with fuel from the tank leaving the bike to sputter and die.

I re-routed the fuel lines, removed the inline filter and hooked up the fuel pump again. Rode it around for 4 miles and no issues at all. I'm about to take it out for a longer ride and see what happens. The current set-up is fuel lines (no in line filter) to fuel pump with filter attached then a line form the pump/filter to the tank.

(I also removed the carbs and checked all jets and passages and screens, everything was and is clean).

 

Ok got it. That clarifies everything now. Just wondering about that inline filer you put on. Sounds like it will not pass enough fuel as quick as the motor wanted. Is that the one you are using still? If you still have the problem could you remove the filter altogether for a test run of 20 miles or so? Some filters are not meant for high flow, sort-of-speak. Your filter fit under the pump like my 83?

Seeing you had your carbs off I'm assuming their vents are all open and the hoses are not getting pinched when you put tank on or anything like that? Hope all is fixed. I know stuff like this is a PITA to deal with at times.

 

Funny, that's the exact same pump I just got!!!!! Okay, here's the update, I ditched the filter and after I put everything back together I re-routed the fuel lines from the pump to the carbs. Went out for a ride and 90 miles later everything seems good to go. No hiccups or issues. She ran great albiet, a little chilly out. I'm thinking the issue was a combo of the filter and the route I had the fuel lines set. Hopefully she's fine now. Tomorrow will be the test. I'm riding up to my new command to get decals for the bike and see where the Seabees will have me working. Should be a good test. I'll report back.

Thanks for all the help and direction.

 

180 miles riding today. No issues, ran great. Guess the problem is now gone.

 

That's great. Keeping my finger's crossed.

So, for clarity sake, no inline filter at all? Does the pump have a filter on board? Can you post model number of pump for those that may need one? I wonder how it would run with a filter between the pump and the carbs? Too much work for the pump?

 

Correct, the pump has a filter attached at the inlet. No filter from the pump exit to the carbs. I think this was a big culprit to my issue. I had a filter after the pump including the pumps attached filter. I don't have a make and model number but I do know it is a Autozone universal micro fuel pump for carburated engines. Pumps approximately 2-3 psi. In fact, on page one it is the exact same pump that is pictured towards the bottom of the page.

Again, thanks for all the help. Definitely a learning experience.

 

Correct, the pump has a filter attached at the inlet. No filter from the pump exit to the carbs. I think this was a big culprit to my issue. I had a filter after the pump including the pumps attached filter. I don't have a make and model number but I do know it is a Autozone universal micro fuel pump for carburated engines. Pumps approximately 2-3 psi. In fact, on page one it is the exact same pump that is pictured towards the bottom of the page.

Again, thanks for all the help. Definitely a learning experience.