Fueling issues, hard start - Dodge Cummins Diesel Forum
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post #1 of 16 (permalink) Old 10-12-2019, 05:15 PM Thread Starter
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Fueling issues, hard start

Howdy
I'm at the end of my 93 12 valve conversion and am having trouble getting it to start. I did the 3200 gov spring, thd fuel pin and injectors. I have a draw straw going through a 140 micron filter to a half inch line going to a hvlp pump. I primed the stock filter by hand through the bleed screw, then cracked the injector lines and cranked her over. Just a little spray is coming out when I do that. Checked the fss, turned the fuel pin one turn and made sure the throttle linkage was clocked correctly. It tried to start one time and sent a geyser of fuel out of the line when it did. I shut it down to close the line and nothing after that.

Do the stock systems have an anti drain back valve to keep the system primed?

What else could be going on here? The fuel pin was pretty hard to turn in after 1-1/2 turns in. I was going to take the pump apart and send pictures to Eric at hungry diesel but it got late and below freezing.

The engine was running like a champ before I did the conversion. Thank you for the help, I'd love to get this wrapped up soon.


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post #2 of 16 (permalink) Old 10-12-2019, 05:46 PM
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Did you back out the fuel screw when you had the top off to do the 3200 spring? My guess is the fulcrum lever got damaged when you put the top back on the injection pump....very common issue when people open it up to install a 3200 spring.

1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 370K Km's, hydroboost, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.
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post #3 of 16 (permalink) Old 10-12-2019, 06:03 PM Thread Starter
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I unscrewed it out past the o ring. I was watching a bd diesel video how to when I did the install. Everything came apart and installed easy, it was on an engine stand at the time

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post #4 of 16 (permalink) Old 10-12-2019, 06:21 PM Thread Starter
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How do you tell if this arm got damaged? I'm able to work on it tomorrow before I leave for work. Just pull everything apart again like you're installing the spring?

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post #5 of 16 (permalink) Old 10-13-2019, 12:30 AM
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How do you tell if this arm got damaged? I'm able to work on it tomorrow before I leave for work. Just pull everything apart again like you're installing the spring?
If you backed the fuel screw out it shouldn’t have damaged the fulcrum lever. Did you make sure the throttle arm was indexed properly?
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post #6 of 16 (permalink) Old 10-13-2019, 10:23 AM Thread Starter
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I double checked it after trying to start it for a while. I wonder if I'm just losing prime somehow, it did try to start and throw high pressure fuel once.
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post #7 of 16 (permalink) Old 10-13-2019, 05:21 PM
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I have seen people on the board before who couldn't get it started and it was due to a weak battery or starter....just not cranking fast enough.

1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 370K Km's, hydroboost, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.
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post #8 of 16 (permalink) Old 10-13-2019, 07:06 PM Thread Starter
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I'll hook up a battery charger, it's cranking over pretty fast with the third gen starter. I even re hooked my in tank electric pump to make sure I had fuel pressure. Still not throwing fuel up very high

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post #9 of 16 (permalink) Old 10-13-2019, 07:59 PM
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Pull the plunger and spring from the fss
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post #10 of 16 (permalink) Old 10-13-2019, 10:03 PM Thread Starter
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Could that be sticking? It's actuating pretty loudly when I pull the voltage from it. The motor started instantly before we pulled it from the wrecked truck. I'll look into to that though. I'm driving to north Dakota tomorrow for work and won't be back for two weeks

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post #11 of 16 (permalink) Old 10-14-2019, 12:11 PM
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Could that be sticking? It's actuating pretty loudly when I pull the voltage from it. The motor started instantly before we pulled it from the wrecked truck. I'll look into to that though. I'm driving to north Dakota tomorrow for work and won't be back for two weeks
When you say you checked the fss did you pull it apart and check the plunger or just listen for the click? Yes it can stick but it is pretty simple to pull I would do that to eliminate a variable. Also when you are bleeding hold your foot at half throttle and see if you get a strong spray of fuel.
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post #12 of 16 (permalink) Old 10-14-2019, 04:46 PM Thread Starter
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Honestly I just listened for the click, sounded strong. Next time I'm able to work on it I'll pull it apart and eliminate it temporarily. I did the half throttle while bleeding, found an old dodge instructional video that was adamant about doing that. Since it tried to start once, it might be sticking and it's easy to check. If it doesn't start I'll pull the pump back apart and check the fulcrum arm.

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