Quantcast
Jump to content


2021 Massimo T-Boss 550 fuel supply issue

JDSmith

By JDSmith
in Massimo UTV SxS Forum

 Share

Recommended Posts

JDSmith Rookie

JDSmith

Posted
Posted

I have a 2021 Massimo T-Boss 550. It was submerged in water for a period (hurricane). All filters/fluids were drained and replaced/refilled immediately after as well as air box cleaned. Drained fuel tank, popped the supply line off and key cycled to clear the line of contamination. Reconnected line and filled with fresh fuel. The machine fired and sputtered for maybe 30 seconds and died. Upon attempting restart I noted the fuel pump wasn’t priming.  I checked voltage at the pump and it is 12v. I’ve replaced the coil pack, wire, ecu, ignition (which was failing just prior to the water event) and the fuel pump. The new pump still does not engage. Rechecked with new pump and there is 12v at the plug on top of the tank as well as down at the pump. I’ve popped apart all the plugs I can see, sprayed them with terminal cleaner and applied dielectric grease. Still nothing. I’ve talked to a buddy and he has said it has to be a connection or ground issue.  Anyone able to point me to specific plugs wires etc to check? I’m paying for the answer. 😂 

  • Alex changed the title to 2021 Massimo T-Boss 550 fuel supply issue
JDSmith Rookie

JDSmith

Posted
  • Author
Posted

I will have to look for that relay. From what I can see I believe my fuel pump relay is a little different.  I don’t have a relay checked for this type, but I wasn’t thinking it was the issue as I can feel the click in the relay when key is cycled. No more than they cost and it’s not like I haven’t thrown $400-500 at it already I should just try it I suppose.

7A901247-E954-451F-8294-50BD6677DDA1.jpeg

  • 2 weeks later...
JDSmith Rookie

JDSmith

Posted
  • Author
Posted

Tank was drained and refilled. Purged line and reconnected. Started and ran for about 15 sec before dying. Noticed at that time the fuel pump wasn’t priming anymore. 
 

I’ve also replaced the fuel pump. So unless the original and then the new replacement was bad, it’s not the pump.

JDSmith Rookie

JDSmith

Posted
  • Author
Posted

That’s the consensus. I’ve cleaned and dielectric greased all the connections and no change. I’m having a mechanic check it out tomorrow.

  • 5 weeks later...
  • 1 month later...
Greg Kilgore Collaborator

Greg Kilgore

Posted
Posted

I know its an older post. But I agree that it seems like it is a ground issue. If the original poster would post his resolution that would help.

But some info on relays and power. And if I wrong it won't be the first time.

The relay should supply the positive 12V DC power. To whatever. The ground or negative side should go to a frame ground or back to the battery.

Frame grounds are a lot of problems on many many electrical issues on a lot of vehicles. Whether it's a side by side or a 2001 GMC Sierra dash cluster (don't ask) or a 1997 Dodge Dakota dash cluster (ground point under the kick panel on driver and passenger side).

Cleaning the ground points or running a ground wire back to the battery should resolve the issue. If the fuel pump and relay is good.  

But usually there are many circuits feeding off one ground point. So it would be best to follow the ground coming off the fuel pump to make sure the ground point is making good contact to frame. 

The ground wire can be tested with a multi-meter.

1. Set multi-meter to OHMS.

2. Hold one lead of multi-meter to the other lead of multi-meter. The reading should be 0.0 to maybe 0.2. That will be the reference of the meter and also tells you there is little to no resistance between the leads.

3. Now take the negative side of the fuel pump wire to one lead of the multi-meter. and touch the other lead to a UNPAINTED part of the frame. The reading should be the same or maybe 0.1 more than when you touch the leads of the meter together. 

If no reading or a very high reading that would indicate a bad connection to ground somewhere and the ground point would need to be cleaned.

 

Hope this info helps you or someone. I'm not responsible if anything unwanted happens while you're testing.

 

JDSmith Rookie

JDSmith

Posted
  • Author
Posted
3 hours ago, Greg Kilgore said:

I know its an older post. But I agree that it seems like it is a ground issue. If the original poster would post his resolution that would help.

But some info on relays and power. And if I wrong it won't be the first time.

The relay should supply the positive 12V DC power. To whatever. The ground or negative side should go to a frame ground or back to the battery.

Frame grounds are a lot of problems on many many electrical issues on a lot of vehicles. Whether it's a side by side or a 2001 GMC Sierra dash cluster (don't ask) or a 1997 Dodge Dakota dash cluster (ground point under the kick panel on driver and passenger side).

Cleaning the ground points or running a ground wire back to the battery should resolve the issue. If the fuel pump and relay is good.  

But usually there are many circuits feeding off one ground point. So it would be best to follow the ground coming off the fuel pump to make sure the ground point is making good contact to frame. 

The ground wire can be tested with a multi-meter.

1. Set multi-meter to OHMS.

2. Hold one lead of multi-meter to the other lead of multi-meter. The reading should be 0.0 to maybe 0.2. That will be the reference of the meter and also tells you there is little to no resistance between the leads.

3. Now take the negative side of the fuel pump wire to one lead of the multi-meter. and touch the other lead to a UNPAINTED part of the frame. The reading should be the same or maybe 0.1 more than when you touch the leads of the meter together. 

If no reading or a very high reading that would indicate a bad connection to ground somewhere and the ground point would need to be cleaned.

 

Hope this info helps you or someone. I'm not responsible if anything unwanted happens while you're testing.

 

 

JDSmith Rookie

JDSmith

Posted
  • Author
Posted

Well we just got it back running…

it was the fuel relay and ecu. Turns out the new ecu was bad as well. A dealer was able to pull a working one off a new unit and it all worked. 
 

the new issue when you put it in reverse it defuels and dies now. The speed sensor is allegedly a common issue, replaced it and same thing. So we just had to leave the speed sensor unplugged and it’s fine. Dealer said Massimo said the causes would be ECU, Speed sensor, or the dash. I’m not replacing the dash so it is just no speedometer for me.

Greg Kilgore Collaborator

Greg Kilgore

Posted
Posted

Glad you got your machine back running. Hopefully the ECU was covered since it was DOA.

I'd guess that since the machine was submerged for a minute or two. There may be more electrical issues pop-up from bad sensors. 

At least the resale value should be higher since your not racking up miles.😁

You may have more relays go in and out or ground issues in the coming future. 

Could an app and cell phone for speed if needed.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Similar Topics

    • Nutcase
      Joyner trooper Fuel injection
      By Nutcase
      I have a Joyner Trooper 1100 4 place that has been sitting for a number of years. I have everything taken care of but i can't get the fuel through the injectors. Fuel pump puts full pressure on them but they don't turn on or spray fuel. Any ideas?
    • Cory J
      2023 t-boss 550 belt slipping and found oil in belt housing
      By Cory J
      Belt started slipping when I used it in high gear. It works okay in low unless I'm trying to power it up a hill and then it slips.., Ordered a new belt and went to change it and found a good bit of oil in the belt housing. Has anyone experienced this? Belt looks fine. Only have 300 miles on this thing..
    • Ductking1
      2024 Hisun Sector 550 gear sector binding
      By Ductking1
      I recently purchased a 2024 Hisun 550 Sector from Kreps Service Station and am having issues with the gear selector, I am doing as instructed in the owners manual but the shifter acts like it is binding or the button lock isn't releasing, the shifter will not move, I have to wiggle it back and forth while pushing hard on the brake and if it's in park or reverse it's nearly impossible to get it to move, I contacted Justin Krep and he says this is normal with these machines, I find that hard to believe, I've owned many utvs and side x sides and have never had this kind of issue with any of them, any help with this problem would be greatly appreciated.
    • JSwearer
      T-Boss 550 aftermarket suspension suggestions
      By JSwearer
      Does anyone have any suggestions for aftermarket shocks.  I have a T-Boss 550 and took it riding in some rough trails and the stock suspension was uncomfortably rough.
      Thanks
    • Jim Kessell
      EH65 spitting fuel from breather hose into air filter.
      By Jim Kessell
      2005 American Landmaster
      EH65 Subaru Robins
      spits fuel from breather hose into the air cleaner and then down into carb.  What’s causing this ??

UTV FORUMS

MORE SECTIONS

FOLLOW US ON

GET IN TOUCH

  • Automotive Webmaster
×
×
  • Create New...