Isl 400 start but no run

[994wilson]

Good evening everyone I am currently in Naples Florida and I need help I have a Holiday Rambler Scepter 42 PDQ with an ISL 400 Cummins I wanted to make it go and by turning the key no WAIT TO START and the primer pump is not working it is probably a relay or a fuse is there any one of you that has happened with a 2008 scepter thanks in advance

[Skip426]

The , Wait to start , function is ambient temp related , above approx 50f it won't come on .

I do find your post a little confusing , so I'll ask questions .

Does the engine crank over , but not start ?

Or does the engine start and not continue running ?

How have you determined that the primer ( lift ) pump is not working ?

What chassis is your coach built on ?

[994wilson]

Good evening thank you for taking the time to help me that's correct the engine runs but does not start and for what is the primer pump every time I turn the ignition key the primer pump turns a few seconds and for the hear you have to be at the back of the motorized it's a Roadmaster RR10 chassis today I checked all the fuses and the relays and everything is correct

[Skip426]

Originally Posted by 994wilson

the engine runs but does not start

Wilson ; it's been 58 years since my last attempt at conversing in written or spoken French so I'll have to stick to English .

The correct description of your problem is " cranks over but won't run ."

If you leave the ignition switch in the run position , for about a minute ; does the CEL ( Check Engine Light ) stay on ?

How long has it been since the engine last ran ?

[994wilson]

Good morning SKIP 426 thank you for the effort you give me to find the problem it is the intention that counts: the engine starts but does not run: the CEL does not light up: wait to start either: the primer pump does not work: it has been a month and a half since I have not driven: I have checked all the fuses and all the relays everything is correct Please help me find the problem

[994wilson]

Châssis Roadmaster RRS 10

[jleonard]

Some of the fuel solenoids have 2 coils. One moves the solenoid, the other holds it in place once it starts.
You may have a bad solenoid.

[994wilson]

Originally Posted by jleonard

Some of the fuel solenoids have 2 coils. One moves the solenoid, the other holds it in place once it starts.
You may have a bad solenoid.

Are you talking about the solenoid of the electrical panel next to the driver's seat

[Skip426]

Originally Posted by jleonard

Some of the fuel solenoids have 2 coils. One moves the solenoid, the other holds it in place once it starts.
You may have a bad solenoid.

This style of solenoid hasn't been used on Cummins fuel systems since the late 1990's ; P-7100 mechanical injection pump.
2008 ISL , has HPCR fuel system ( High Pressure Common Rail ) with electronic fuel injectors , and to stop the engine the ECM just stops firing the injectors.

[Skip426]

Originally Posted by 994wilson

Good morning SKIP 426 thank you for the effort you give me to find the problem it is the intention that counts: the engine starts but does not run: the CEL does not light up: wait to start either: the primer pump does not work: it has been a month and a half since I have not driven: I have checked all the fuses and all the relays everything is correct Please help me find the problem

So the engine runs momentarily , but then stalls .
In a month and a half there may have been rodent damage to the electrical or fuel system on the coach; or the lift ( primer ) pump has failed.

I don't have information on the lift pump location ,or testing, on the 08 ISL , but I'll see what I can dig up online .
It is possible that this will not be a DIY repair ; are you close to a Cummins repair shop ?

[jacwjames]

Do you have any electrical diagrams for your coach.

You may check in/around the engine compartments to see if there are any small fuse holders.
On my coach I have 4 different fuse holders in my rear passenger side electrical compartment. Each fuse holder has 1-3 fuses. These fuses are for the engine and transmission. One fuse will protect the ECM. The ECM is what probably signals the lift pump to work.

This is for a 2002 Windsor with and ISC but my guess is that the ISL will have a similar configuration re fuses.



Also, if you have a Cummins Quickserve account you can find an electrical diagram showing the cummins side of your system.

[994wilson]

Originally Posted by Skip426

So the engine runs momentarily , but then stalls .
In a month and a half there may have been rodent damage to the electrical or fuel system on the coach; or the lift ( primer ) pump has failed.

I don't have information on the lift pump location ,or testing, on the 08 ISL , but I'll see what I can dig up online .
It is possible that this will not be a DIY repair ; are you close to a Cummins repair shop ?

I'm in Naples and there is a Cummins garage in Fort-Myers I hope they can move

[Skip426]

I had a thought overnight ; check the air intake and filter for restrictions ( water soaked ) parked for a length of time the intake could have been plugged by a nest or the air filter element may have got wet.

[koda59]

Just a thought, have you changed your fuel filters while you wwere there? You might check to make sure they are not sucking air and are tight.