Hard start m35

[Adam Brice]

Hi guys.
So I just changed my fuel filters on the multifuel, and now I'm having issues starting. It wont start unless I bleed it out on top of the fuel block every time. Used to start right off on first crank. I'm guessing one of the o rings on secondary or final filter isn't sealing correctly now, and introducing air?

 

[Floridianson]

While anything is possible one would think anything after the booster pump would leak fuel being under 60 psi of pressure. I would look at primary fuel filter then even rubber fuel hose on in tank.

 

[INFChief]

Couldn’t hurt to verify that the fuel pump is working.

 

[frank8003]

Couldn’t hurt to verify that the fuel pump is working.

Just put a small gauge in that gauge hole, 1/8" NPT and you will always know if the pump is out puting pressure thru the in-tank hose to the system. That is a test gauge fitting hole in the output block as per the TM. A Deuce will start and run good with a tight system until you break it open to change the filters. Not good for the booster pump but it'll do it.
See photo, little gauge bottom right.

 

[Adam Brice]

Couldn’t hurt to verify that the fuel pump is working.

Yes sir. Pump was previously not working, before I did filters. Checked that before I pulled filters, to find out that the fuse terminals were crusty. Cleaned them up, and pump works. Then I went on to change filters.

 

[Adam Brice]

Just put a small gauge in that gauge hole, 1/8" NPT and you will always know if the pump is out puting pressure thru the in-tank hose to the system. That is a test gauge fitting hole in the output block as per the TM. A Deuce will start and run good with a tight system until you break it open to change the filters. Not good for the booster pump but it'll do it.
See photo, little gauge bottom right.View attachment 847760

Yep. I know my pump is working, cause when I crack open the bleeder on top of the filter mount, fuel comes out pretty good when switch is activated. I will look into getting a fuel rated gauge though, as it would be nice to know available pressure.