I can tell you exactly what that leak is. 2 years ago my engine would start and then stall out 1 minute later. This went on-and-off for 2 years.
Solution: You just need to tighten your 3-lift pump bolts, but not too tight!
Air can get sucked into your CAPS injection pump that that is really, really BAD! So consider yourself lucky you caught this warning sign. And now you have a choice to make:
A) You can keep tightening those lift pump bolt every 10,000 miles, and that may or may not stop your fuel leak; or...
B) You can install a FASS 12V electric fuel pump and that will probably save you from a $6,000-$9,000 CAPS Injection Pump failure in the future.
Note: My CAPS injection pump failed around 84,000 miles and when it malfunctioned due to heat caused by loss of lubricity (air in the fuel line) it lost it's suction and ran dry too many times.
So installing a FASS or AirDog electric fuel pump will cure this problem.
Note: I first installed the FASS and wrote a lot about it on
www.IRV2.com. So if you want more information you can search my user name on IRV2.com. ...But I did not change the fuel lines to the lift pump. So 25,000 miles later, as in last week, i too saw fuel dripping off the starter just like you and there was diesel fuel drops on the lift pump.
Sure enough, my 3-lift pump bolts were loose again by about 1/4 turn. ...Only this time I bypassed my #3 filter by creating a "closed loop" with the lift pump.
Note: A cleaner way to do it would be to remove the #3 filter and fuel lines to the lift pump and then insert plugs, but I am traveling and just swapping a few JIC fuel fittings was a lot easier and only took 20 minutes.
Now I have no fuel leaking and I'm only using the FASS Titanium Fuel Pump 2-Filters and my #3 fuel filter is not in service.
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If you have never gained access to the top of your engine you do it by lifting the floor board between your bed and closet. This board has 4 wood screws 3" long to secure it to your raised step.
Note: You also have to work from inside your closet. Just remove the trap door and an "L-bracket" that has 8 screws holding it.
...And if you have a big air hole (gap) allowing engine hot air to get sucked into your basement AC intake register, this is the time to plug that gap!!! I used insulation and put the paper or plastic side facing the air filter.
OTHER TIPS:
* I highly recommend you add a FASS fuel pump with remote fuel pressure gauge ($150).
* This is a good time to add insulation around your engine hood. I even added insulation under the bed. Note: I used the type of insulation with a plastic backing that you buy for water heaters, but standard house insulation should be okay too.
* I recommend you add an EGT, which is real easy ($150). It will change the way you drive!
* And I recommend you put an Ag Diesel Performance Module in your ISC-350, but this is for the RV who has everything.