Fuel regulator probs

I have 2004 Powerclean 5.9 with a Nissan motor - unit kept shutting down after a few seconds after starting. At times it would run longer, I thought it was the electric fuel pump so I switched it. But I notice still there is no fuel coming out of the return lines back to the tank. So i checked and there is no fuel coming out of the fuel regulator. Where can I find a regulator for this engine? It is a Zenith fuel injection. Is there an after market or car substitute?

Frogs I know the feeling, I have replaced fuel pumps, CPU, regulator, it would seem to work for a bit then it would act up again, SUPER frustrating and there is no one in my area who works on these units. In my case after spending all that money was to disconnect the fuel pump from the cpu power and wire it directly to the ignition switch, so for the past 4 months since doing that I have had 0 probs and that solution cost me $0. The power supply from the cpu would be intermittent, so that led me to believe it was the cpu failing (could be one of the other sensors (oil pressure, overheat) that is triggering the cpu) but after changing the cpu it would still act up, so I tried power from the ignition switch. Give this a try FIRST before spending all the money I have.

Let me know if that helps, if not I have a few other ideas, I do feel your frustration. When it runs it runs great but it is a fairly complex unit with way to many solenoids and controls.

DAve

If you do decide to replace any parts related to the Zenith System call that number for Zenith they were very helpful, and 1/3 the cost of my local Prochem dealer. Prochem used the same system on the units of the same years.

My fuel issues began again this week, with a my fuel pump failing (it was 3yrs old) could not find the same model as that so I got another one only to have my old issues return, stumbling on load, dieing right out, etc. Thought it was air, bled the fuel system, ran better, but would die in 5 min. Then after switching around all my spare parts, I came to realize that I needed a pump with a MINIMUM pump pressure of 10 psi, the one I had bought was 5.9-9.5 psi. So went and bought another fuel pump 10-15 psi and it ran perfect. After testing around the shop for 20 minutes under load I thought it was fine to send back out, after 30 minutes it just shut off. grrrrrr and would not restart, and as per murphy's law I literally had 6 more wand passes. So I found the front top 30 amp fuse had blown, and found a bare rub spot on that wire near the fuse block. So went and changed fuse and it finished the job, but that was friday and we sent the other trucks out till I can confirm this one is reliable again. Such a pain sometimes. Think I will just stick to my drive shaft units in the future. I have 2 new slide ins (06) and one 1996 drive shaft unit (cleanco) and the drive shaft has given me 0 probs.

Keep me informed maybe between the two of us or other owners of these nightmares may join us here; we can keep things going long enough to to afford a big enough hole in the ground that we can bury them.

DAve

Okay mine is still down, if yours keeps running I will drive down and drop mine off to you for spare parts save me from digging that hole. Checked the grounds they were loose, did not fix the prob, checked all wires looked good, did by pass the waste tank just in case it was faulty but no luck. Have thought about going to a carb they are $241 but just sooooo sick of fooling with this unit and spending gobs of money on it. When it runs it runs great but I just wait for the phone call from the crews telling me it died again.
Hope yours keeps going let me know.

I was hoping you had her fixed, mine has been down for 2 weeks I can not even bear to deal with right now I have enough spare trucks I don't need it right now. Only real prob with carb kit I figured out is it has no governor - so it would need a electronic one or a cruise control hooked up and that is beyond me. Carb would install easy but the rest I don't care to tangle with. Once I am back from holidays I will begin again tinkering but it sooo unreliable now and a money pit my guys think I should scrap might buy a diesel Kubato and drop it in, who knows cheaper then a new unit.

No luck at all - sad I am thinking of scrapping it seems like a shame with less than 5ooo hrs on it but have spent sooo much time and money and it is sooo unreliable and unpredictable. You change one thing and it may run for an hour or two weeks then it acts all up, I am a pretty handy shade tree mechanic but I am stumped. Wondering if any one has converted one of these to carb and an electronic govenor - I don't care to experiment any more if some one has not tried it before. Currently looking at another TM to replace and call it a lesson learnt only buy from a local dealer who can work on the unit no matter how handy you may think you are!

Who was the person you were dealing at Zenith? What you said makes alot of sense. Keep me informed Geoffrey as to how it runs over the next few weeks. Either here or you can email at dave@aaasteamcarpetcleaning Hope this solves this.

Thanks Kelly I will be giving you a call any help would be appreciated - what is the best time to call?

Hey Geoffrey

I was wondering how you have been making out? After sending in my CPU to be tested (it was fine), checking and rechecking all wiring changing fuel pumps. I finally believe I have found my prob. It has been running fine now for a couple hundred hrs. It was the fuel pump the Zenith system requires quite a lot of pressure to properly operate. I had noticed that when I started having probs way back that I could not see much or any fuel by passing back to the fuel tank. So I changed the fuel regulator but no change I changed pumps and doubled up on the pumps. But in the end the pump was too low. So the it would run fine for a bit but when it required more pressure it could not get it from the pump the engine would start to lean out, and make it run warm which would trigger an over heat code in the CPU and it would shut dw. So now with this new high pressure pump lots of fuel is by passing now to the tank.