can i pick your brains please

[helokittylovr]

Re: can i pick your brains please

ok thank you ill start on that tomorrow

 

[nwcove]

Re: can i pick your brains please

dont jump at that approach just yet! wait for other opinions, hopefully someone may chime in and offer an easier way around your troubles.

 

[helokittylovr]

Re: can i pick your brains please

ok thanks

does anyone else have any ideas?

i did order a new pump all metal body with 3 ports i think this might work better it should be here in a few days

 

[helokittylovr]

Re: can i pick your brains please

hello again i installed the new pump and ran black fuel lines and drilled and taped the side plate on the motor and installed a nipple for my pulse port i also took the little filter in the carb bowl out and put a filter in the fuel line from the tank. i made sure that the tank and the internals were all working and started the motor and it runs until the the fuel filter is empty the filter is clear and when i prime it it gets about half full then i can see the fuel get sucked out but no new fuel being sucked into the filter. i changed the primer bulb thinking that the primer was not holding enough pressure and i shortend the hose thinking that the longer hose would need more drawing power but that didn't work so i picked up the tank after i started it and fuel filled the filter and the motor kept running without having to pump the primer bulb

so what im thinking is that my pump might be to small and thats why its not drawing enough fuel into the filter?? possibly
what do you guys think??

thank you for all your help so far

 

[nwcove]

Re: can i pick your brains please

what type of pump is that? any properly working pump should deliver more fuel at idle than the engine will need tho. are you 100% positive that you have the " fuel in" and the "fuel out" lines connected right? the pulse line does appear to be right. and i do notice that you havent put a piece of line on the old pressure fitting, and plugged it with a bolt. not sure if that will decrease crankcase pressure enough to make the pump not pulse well or not?

 

[HighTrim]

Re: can i pick your brains please

Ok, after all the mods Im a bit lost, but as you sit right now, yo need to block the old pressure line as stated above. Just stick a few inches of fuel line on it and plug it with a bolt. Also insure that your previous modification to the intake manifold has been completely erased. Your previous issue was most definately using the pressure tank, cannot really be done. I have never like modifying the intake manifold, have not had much luck with it on the motors that you can tap the bypass cover such as the QD. The 5.5 of course you have to.

 

[helokittylovr]

Re: can i pick your brains please

its a go cart small engine pulse pump of ebay . i did check that the lines are ran corectly and i pluged the old pulse port from the inside with jb weld. also when i took the pulse hose off i get a lot of preasure so im still thinking that i need a bigger pump

 

[helokittylovr]

Re: can i pick your brains please

sorry i just noticed that my last post didnt post
i got a bigger pump and made sure that all the hoses are correct. and it has good suction but it still wont draw enough fuel into the fuel filter i tried to see if it would draw fuel with the primer bulb off and it will draw and keep going but it i have to keep feathering the throttle i un hooked the fuel line in at the pump and tried to see what was happening when i primed the line. there is alot of air and just a little gas that comes sputtering out and then it sounds like the primer bulb is sucking in i have tried 2 different bulbs and they were going in the correct direction i dont know how to get a good suction with no back flow

thanks for your help

 

[RogersJetboat454]

Re: can i pick your brains please

Silly question...
Is the vent on the fuel tank open?

 

[helokittylovr]

Re: can i pick your brains please

yes it is open

 

[Daviet]

Re: can i pick your brains please

You should not be getting any back flow through the primer bulb, there are check valves in the primer bulb so that gas can only go one way.
You say that you can keep it running if you feather the throttle, do you have the low speed needle valve set correctly?
Try putting the fuel tank above the engine, on a ladder or something, and run the fuel line from the primer bulb directly to the carb. Will it start and run that way, if so you have a problem with the fuel pump or the way that it is plumbed.

 

[helokittylovr]

Re: can i pick your brains please

there is a little back flow in the bulb the low speed is set at the starting point and i have adjusted to ceep it running longer when i have the fuel tank above the motor it stays running and the filter fills full i have tried 3 bulbs and they all do the same thing there is a little back flow and my pump is from a john deere riding mower 25hp so it should be big enough i have good pulse but it just isnt drawing it up the hose

 

[nwcove]

Re: can i pick your brains please

just a couple of questions, just to confirm things......have you returned the intake manifold to its all original setup...except for blocking the pulse port?

are you using after market connectors on the fuel lines? if they leak air anywhere it will cause grief. do you have a connector on the tank?

 

[helokittylovr]

Re: can i pick your brains please

no i still have the plugs in the plate blocking air flow
the connector on the motor and the end of the hose are new and seated good no leaks that i can tell
on the tank there is a nozzle coming out of the tank and the hose is clamped to it directly

 

[helokittylovr]

Re: can i pick your brains please

bump

 

[nwcove]

Re: can i pick your brains please

no i still have the plugs in the plate blocking air flow
the connector on the motor and the end of the hose are new and seated good no leaks that i can tell
on the tank there is a nozzle coming out of the tank and the hose is clamped to it directly

i think its been mentioned more than once that you should un-do, whatever you have done to modify the intake manifold, just to help diagnose your issue.

also, have you tried connecting the fuel line directly to the inlet of the pump? ie.....bypass the connector.

 

[colbyt]

Re: can i pick your brains please

no i still have the plugs in the plate blocking air flow
the connector on the motor and the end of the hose are new and seated good no leaks that i can tell
on the tank there is a nozzle coming out of the tank and the hose is clamped to it directly

You said plugs. When using an external pump with a pulse hose attached you only block one of the holes under the carb. The posters who have mentioned tank venting are steering you in the right direction.

 

[nwcove]

Re: can i pick your brains please

You said plugs. When using an external pump with a pulse hose attached you only block one of the holes under the carb. The posters who have mentioned tank venting are steering you in the right direction.

in this case,....if ive read correctly.... there has been mods done to the intake manifold, and the bypass cover has been drilled and tapped also, which is now the source of the pulse to the pump.

 

[colbyt]

Re: can i pick your brains please

in this case,....if ive read correctly.... there has been mods done to the intake manifold, and the bypass cover has been drilled and tapped also, which is now the source of the pulse to the pump.

I may be wrong but I thought the OP said he used the one in the middle of the linked page.

 

[nwcove]

Re: can i pick your brains please

maybe im confused, but it does seem as tho the intake was modded as per a 5.5, then the bypass cover was modded for a 7.5 etc. if the first mods ( normally for a 5.5) werent completely put back to original.....and i honestly dont know if it will make a difference. its hard to help out,..... with so many changes, its worth the time to undo the manifold changes. jmo