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Author Topic: 3304 cat fuel pressure  (Read 1308 times)

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Offline Caseybow123

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Re: 3304 cat fuel pressure
« Reply #20 on: November 19, 2020, 11:06:13 AM »
My primer pump is different, probably due to engine arrangement however it serves the same purpose. 
I know when you see brass filings when trying to prime the system,  "Time to replace".


 

 

Offline Caseybow123

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Re: 3304 cat fuel pressure
« Reply #21 on: December 22, 2020, 10:03:47 AM »
Replaced hand primer pump yesterday as I knew it was not operating properly. Hard starting issues still remain.  The only plus side is that I can now prime the fuel system to help with starting,  but has not fixed the problem. What next, transfer pump??

Offline barbender

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Re: 3304 cat fuel pressure
« Reply #22 on: December 22, 2020, 10:40:18 AM »
How is your fuel supply coming to the pump? Does it gravity feed from the tank? Being you had bad fuel, I would suspect a supply line restriction. That wouldn't cause it to lose pressure while sitting, but I'd still start there and make sure the supply pump is getting plenty of fuel to begin with.
Too many irons in the fire

Offline Caseybow123

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Re: 3304 cat fuel pressure
« Reply #23 on: December 22, 2020, 11:05:09 AM »
I blew out all lines so I know that there is no fuel restriction.  Also, when I do get the skidder started, it runs fine with no hesitations or loss of power.

Offline mike_belben

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Re: 3304 cat fuel pressure
« Reply #24 on: December 22, 2020, 12:20:59 PM »
Hmm..  
Revelation 3:20

Offline barbender

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Re: 3304 cat fuel pressure
« Reply #25 on: December 22, 2020, 12:33:12 PM »
Well, it does sound like a low pressure dude bleed off of some sort, if you have good supply. I had an old 5.9 Cummins  with a rotary pump, it would bleed pressure off and I would have to hand prime it to get it to start. If your hand primer won't build pressure, and there is fuel to getting to it, then it would have to be a faulty primer or something else on that low pressure side like the return lines and other items these guys have mentioned.
Too many irons in the fire

Offline barbender

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Re: 3304 cat fuel pressure
« Reply #26 on: December 22, 2020, 12:36:20 PM »
I've also had times where I blew air back to the tank, but the debris would close the line right back off. Are you sure fuel is physically getting to the pump? I had a machine where a piece of rubber came loose inside a line, and would eventually choke off the supply. That was fun to track down. Ponsse used to use regular hydraulic hose for fuel lines and they would fail this way.
Too many irons in the fire

Offline moodnacreek

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Re: 3304 cat fuel pressure
« Reply #27 on: December 22, 2020, 12:53:46 PM »
I've also had times where I blew air back to the tank, but the debris would close the line right back off. Are you sure fuel is physically getting to the pump? I had a machine where a piece of rubber came loose inside a line, and would eventually choke off the supply. That was fun to track down. Ponsse used to use regular hydraulic hose for fuel lines and they would fail this way.
Eventually most any old machine will do this. In my current case There is 'dried peanut butter crumbs' in all my diesel tanks. That's from years of using waste vegetable [blended] for fuel. When you cut open an old fuel oil tank you get quite an education. Worst case may be putting a stand pipe in the tank for the suction line.

Offline mike_belben

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Re: 3304 cat fuel pressure
« Reply #28 on: December 22, 2020, 01:11:53 PM »
No matter how much starting grief it gives, if its got full power all day once you get it running, then we are dealing with a priming and air purging scenario from losing prime one way or the other.  Any fuel starvation is gonna come with a power starvation.  



Let me back up a stage.  How long have you been working this machine?  Is it your first cold season with it?  



Advanced injection pump timing will always be hard to start, nearly impossible in the cold and would act similar to a lost prime malfunction.  In my experience pulled pumps rarely go back where theyre supposed to and a very small percent of the industrial population truly understands injection timing at all.



So if its a new to you machine i am rethinking things on this issue.
Revelation 3:20


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