Wont start, need assistance diagnosing.

[fvfr543]

1966 M35A2, 465-LDT

I was driving the deuce this spring after just getting it running for the first time, Lost power while driving, didn't want to idle, had to keep the throttle mashed, limped it home. Replaced Filters. Replaced the injectors. Currently Fuel to the Injectors, Wont start. Will fire with a squirt of ether. Fuel is good, fresh tank or diesel. Air Filter is clean. FDC has not been bypassed. Flame heater system is installed but does not appear to be damged.

In my mind it has to be a Fuel issue? I fear it has something to do with the injector pump, but I have fuel to the injectors, could the pump just not be producing enough pressure?

I searched for quite a while and couldn't much matching this problem, lots of talk of injector pumps but nothing specific to this. Thanks a ton in advance, I'm still an FNG with deuces.

 

[mmeridith]

1966 M35A2, 465-LDT

I was driving the deuce this spring after just getting it running for the first time, Lost power while driving, didn't want to idle, had to keep the throttle mashed, limped it home. Replaced Filters. Replaced the injectors. Currently Fuel to the Injectors, Wont start. Will fire with a squirt of ether. Fuel is good, fresh tank or diesel. Air Filter is clean. FDC has not been bypassed. Flame heater system is installed but does not appear to be damged.

In my mind it has to be a Fuel issue? I fear it has something to do with the injector pump, but I have fuel to the injectors, could the pump just not be producing enough pressure?

I searched for quite a while and couldn't much matching this problem, lots of talk of injector pumps but nothing specific to this. Thanks a ton in advance, I'm still an FNG with deuces.

Bad hydraulic head, sticking fuel lever, bad HH o-rings. Just went through this myself, hh shaft was scored.

Sent from my SM-G950U using Tapatalk

 

[Floridianson]

http://www.jatonkam35s.com/DeuceTechnicalManuals/troubleshooting the multifuel engine.pdf

 

[AceHigh]

I had the exact same thing. Turned out to be the fuel shut off lever was disconnected. Follow the shutoff cable and remove the cap it goes into, make sure the lever is not swinging free. For me it was a cheap fix (free!).

Hope you get her running soon.

 

[dmetalmiki]

I still have this issue, have done all the above and fitted a new hydraulic head. Still the engine only runs above about 1500 rpm. So I am trending to thinking the hydraulic high pressure feed pump on the injector pump is the guilty component. Anyone any other advice?.

 

[Floridianson]

I still have this issue, have done all the above and fitted a new hydraulic head. Still the engine only runs above about 1500 rpm. So I am trending to thinking the hydraulic high pressure feed pump on the injector pump is the guilty component. Anyone any other advice?.

http://www.jatonkam35s.com/DeuceTechnicalManuals/troubleshooting the multifuel engine.pdf

 

[rustystud]

I still have this issue, have done all the above and fitted a new hydraulic head. Still the engine only runs above about 1500 rpm. So I am trending to thinking the hydraulic high pressure feed pump on the injector pump is the guilty component. Anyone any other advice?.

Do you have a good fuel pressure gauge ? Install it on the final secondary fuel filter and see what your pressure is. The "Troubleshooting Guide" Floridianson posted will have the proper pressures in a chart.

 

[Floridianson]

One should think that if it runs at higher rpm not lower then it's getting some fuel and should idle. Does not take much fuel to idle. What makes the pressure in the Head? What holds the pressure back in the Head? What lets the pressure out of the Head?

 

[FloridaAKM]

I have the same problem with a no start new to me Deuce, but I am still going thru the normal items leading up to getting her running. I don't want to hijack this thread, so over & out!

 

[Floridianson]

I still have this issue, have done all the above and fitted a new hydraulic head. Still the engine only runs above about 1500 rpm. So I am trending to thinking the hydraulic high pressure feed pump on the injector pump is the guilty component. Anyone any other advice?.

If you are sure you have correct timing then you might try and up the main fuel adjustment one full turn. Mark the nut with a black marker so you know where it was to start. If it will idle then you can back down the main fuel nut 1/2 turn and see if it idles at that setting.

 

[dmetalmiki]

OK all..this truck drives good at times..however..it has and does just start running rough, slow down and sometimes darn near stop. Get it to around 2000 RPM and I can 'drive' most places non stop. I still am going to investigate that side pump when I can get at it..a nightmare on my big camper set up. (as if it was not nightmare enough already!.)
Floridianson, 1) in tank pump. 2) high pressure pump. 3) the 'squirty' thing in the hydraulic head. (that quill that goes up and down and round and round.) or should do. A further thought I might go a new pump route. Timing is not a factor in this case.

 

[Floridianson]

I don't think it is the booster pump. Try and up the main fuel if it is to low it will kill the fuel and shut down the engine.

 

[Jeepsinker]

I would check the pressure relief valves for debris or corrosion. One on the fuel filter head and one on the forward side of the hydraulic head. Would be a shame to replace a whole injection pump over a dirty pressure relief valve.

 

[rustystud]

I would check the pressure relief valves for debris or corrosion. One on the fuel filter head and one on the forward side of the hydraulic head. Would be a shame to replace a whole injection pump over a dirty pressure relief valve.

I agree. I told you guys about the one pump I rebuilt that had a severe trash build-up in the booster pump. It was so bad it broke the gear shaft in the pump. Take that end plug out and check the pressure relief valve.

 

[Jeepsinker]

Right, I forgot about the relief valve in the boost pump. So you have three relief valves to check.

 

[Floridianson]

Guess I should have asked was this a running truck and nothing done? Was this engine /IP worked on and what was done?

 

[rustystud]

The no-start happened after driving it for the first time . According to the OP it was working fine, then nothing.

 

[Floridianson]

OK all..this truck drives good at times..however..it has and does just start running rough, slow down and sometimes darn near stop. Get it to around 2000 RPM and I can 'drive' most places non stop. I still am going to investigate that side pump when I can get at it..a nightmare on my big camper set up. (as if it was not nightmare enough already!.)
Floridianson, 1) in tank pump. 2) high pressure pump. 3) the 'squirty' thing in the hydraulic head. (that quill that goes up and down and round and round.) or should do. A further thought I might go a new pump route. Timing is not a factor in this case.

Think I was thinking about this post . Derailed thread so one thread one problem keeps things simple.

 

[DavidWymore]

Also check pressure relief valve on the secondary and final filter rack.

Install pressure gauge in bleeder port for sure.