partsman9199

I roll it over forever and it doesn't fire or start, any suggestions?

Rauschbo

Start by seeing if you're getting fuel to the fuel filter, then past the fuel filter, then to the injectors - this is a quick method of troubleshooting the dreaded LP / IP problem these 24V's have; You might ck / swap the fuel filter first, it may be plugged.

Any more data? When was the last fuel filter swap, any codes, how old is the LP, how old is the IP, do you have gauges (specifically fuel pressure!), any other symptoms prior to the Dead In The Water state it is in now?

Oops, almost forgot - is your fuel tank empty?!?

smokindog

That doesn't sound good.

Unfortunately you need a scan tool to read codes off of a '99.

Try what was suggested above, but it sounds like you need to get the thing hooked up to a DRB and find out what codes are present.

partsman9199

Yes I changed the filter, been having this problem since I bought the truck, the fuel pressure with the water sep. valve open and the guage on the drain pipe is about 15 lbs when turning it over,

as far as I know there is no way to check for codes without going to the dealer, and yes the tank is full and always has been,

but if I give it a small snort of either she fires up and runs perfect, yes I know either is not to be used, please don't post and tell me how bad it is I know already

how do I check the starter relay and how do I check if the system is holding pressure?

I replaced the lines going into the tank because they were rotton, but it is all fixed and blead, but still having the problem

almost forgot I have fuel to the injectors, but is the lift pump suppose tu run every time the motor is rolled over for more than 5 seconds or does it just stay pressurized and wonce below a certain pressure it cycles?

99 cummins

When I still had the stock fuel system I had to have it towed to the Cummins shop because everytime I shut the truck down the fuel would run back into the tank. They told me the ground on the LP was bad and was not closing off to prevent fuel from running backwards through it.

high country

it would be worth looking again at the fuel lines, the slightest leak will let enough air in to screw the timing enough to not start, but run.

partsman9199

how do I test them or tell if they are leaking?

CTD2001

partsman9199,
Your not from Maine by any chance are you? I stopped to help a guys last week with a 99 that was dead on the side of the road, just wondering if it was you?

partsman9199

No I am not from Maine, but do you know how I can test to see if air is getting in the system?
is the lift pump supose to cycle every time it is turned over?

slim51015

Lift pump wil run as your starting it and while the motor is running.

Theres an overflow valve which is also a check valve on the return banjo bolt on the IP. You could see if thats stuck open. Valve should open around 14 psi.

partsman9199

how do I check if it is stuck open?

slim51015

DIAGNOSIS AND TESTING - OVERFLOW VALVE
Fuel volume from the fuel transfer (lift) pump will
always provide more fuel than the fuel injection
pump requires. The overflow valve (a check valve) is
used to route excess fuel through the fuel return line
and back to the fuel tank. Approximately 70% of supplied
fuel is returned to the fuel tank. The valve is
located on the side of the injection pump (Fig. 59). It
is also used to connect the fuel return line (banjo fitting)
to the fuel injection pump. The valve opens at
approximately 97 kPa (14 psi). If the check valve
within the assembly is sticking, low engine power or
hard starting may result.
If a Diagnostic Trouble Code (DTC) has been stored
for “decreased engine performance due to high injection
pump fuel temperature”, the overflow valve may
be stuck in closed position.
A rubber tipped blow gun with regulated air line
pressure is needed for this test.
(1) Clean area around overflow valve and fuel
return line at injection pump before removal.
(2) Remove valve from pump and banjo fitting.
(3) Discard old sealing gaskets.
(4) Set regulated air pressure to approximately 97
kPa (14–16 psi).
(5) Using blow gun, apply pressure to overflow
valve inlet end (end that goes into injection pump).
(6) Internal check valve should release, and air
should pass through valve at 97 kPa (14–16 psi). If
not, replace valve.
(7) Reduce regulated air pressure to 10 psi and
observe valve. Valve should stay shut. If not, replace
valve.
(8) Install new sealing gaskets to valve.
(9) Install valve through banjo fitting and into
pump.
(10) Tighten to 30 N·m (24 ft. lbs.) torque.
REMOVAL
The overflow valve (pressure relief valve) is located
at the outside of fuel injection pump (Fig. 60). It connects
the fuel return line (banjo fitting) to the pump.
The valve has no internal serviceable parts and must
be replaced as an assembly. Two sealing gaskets are
used. One gasket is located between pump and banjo
fitting. The other is located between the banjo fitting
and end of valve.

partsman9199

There is no fitting on the banjo for a 99, only has the banjo fitting, is the check valve in the banjo fitting? thanks for the help guys.................any other ideas????? still not starting.......

Mike D

When you bump the starter does the lift pump run for 30 seconds?

VADSLRAM

I don't want to bring bad news and maybe your fix will be cheap but..
When my 99 wouldn't start I learned a $3000 lesson in trusting a dealer vs going to a cummins shop and putting in my own VP.
Good luck.