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'99 long cranking before it fires, issue

GSP7
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GSP7

GSP7

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My '99 4x4 diesel used to fire right up , lately sometimes it has to crank longer than usual. Not real long cranking over, but noticeably a little longer crank time. Not all the time but did it today 3 times. It always fires though.

I dont drive it every day . Drove it last two days probably 200+ miles

I just put new batteries and military spec terminals and cables on it. Battery ground to frame and body grounds good. Has 164,000 miles, new VP a few years ago , lift pump pressure is ok, Fuel filter changed 5000 miles ago, and the old one was ok anyway . I run 2 stroke oil in the fuel all the time

I plan on putting a Fass pump on it but " Idont think" that is the problem

Any Ideas why it has to crank a little longer to fire sometimes. Or possibilities?

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Mopar1973Man

Mopar1973Man

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What's your fuel pressure during cranking? This will give a clue if there is air in the lines or not.

 

Is there any external fuel leaking around the head? Injection lines or the return lines? Remember the return is at the back of the and can only be seen from under the truck.

 

Suction leak? You'll need 2 people and pressurize the fuel tank after running. This will force fuel out a fuel line with a suction leak because now the lines are all load with fuel.

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GSP7

GSP7

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First thing this morning I checked for codes with my scanner. No codes, clear.

Turned off ignition, removed scaner, Turned ign on and fired right up like normal.

 

It seems after I drive it. Second , third time to start, It cranks cranks longer

 

Checked for fuel seepage yesterday on all injector lines and return line and "T" all are clean no sign of fuel leaks

 

Ive been meaning to buy and install a fass titanium, My replaced cummins stock LP was doing fine but I have noticed its lost 1 or 2 or so pounds of PSI . It doesnt go below 10 PSI though. I run 2 stroke oil/fuel

 

What's your What's your fuel pressure during cranking??

 

 

Fuel pressure is 12, 13,  ign. on, just before cranking, LP goes off, crank it and when it fires 12, 13 again

 

Where is the common place for a suction leak.

 

I had searched for a leak before extensively and did not find any leaks

Edited by GSP7
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Gamble

Gamble

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I would put money on your starter contacts. You can take it apart and clean it up and see if it makes a difference or you can order the rebuild kit from Larry B's and go that route. My .02.(and maybe prior experience)

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GSP7

GSP7

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This morning its firing up fast like normal 4 or five times tinkering with it.  Seems after I drive somewhere and then go to start again it does the long crank issue

 

Its kind of done this off and on for a year. Got the new batterys and redid mil spec terminals and cable ends I thought I cured it. But now its doing it again

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GSP7

GSP7

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I would put money on your starter contacts. You can take it apart and clean it up and see if it makes a difference or you can order the rebuild kit from Larry B's and go that route. My .02.(and maybe prior experience)

 The Starter motor works fine and cranks fine,  Doesnt have anything to do with the starter motor.

Edited by GSP7
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GSP7

GSP7

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Far as suction leak seepage loosing prime, I thought I had that is problem also,,, awhile back, about a year ago, I resealed the stock fuel filter rubber grommet on top , its nice and dry clean now

 

I wiped off the back of the head, where the return banjo is. Its real clean back there no sign of fuel seepage there either

 

Im stumped . Just seems like its loosing prime......

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GSP7

GSP7

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Just talked to Eric from Midwest Fuel Injectoin.

 

Told me to look for air in tank return line, Put a clear hose in line to return to tank to check for air. All so said leaks will show no fuel seepage air can get sucked into the line causing loss of prime

 

Also said check injector connection tubes for seating

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dave110

dave110

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I went through this last year. Replaced all sorts of stuff thinking I was losing prime. Finally called BlueChip and explained to him and bought another VP and all is well again. If you're still running stock lift pumps I'd be concerned. Not trying to scare you but this was my experience. Got worse and worse until I just couldn't trust it anymore. Never had any codes.

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TFaoro

TFaoro

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The next time it does it dump cold water on top of the injection pump.... If it fires right up you probably should start looking for an injection pump. I suggest you support one of the vendors that support the site!

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dave110

dave110

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Mine was supposed to have much less, which is why I fought off replacing it. If it's been starved for fuel and had a used PSG on it when rebuilt then 36k is not too new anymore. Heck I only got 96k out of my motor before the block cracked.Does your tach needle move when cranking? If not it could be a failing crank pos. sensor I've read.

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GSP7

GSP7

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.Does your tach needle move when cranking? If not it could be a failing crank pos. sensor I've read.

Read this and went out to look. It fired up so fast this time hard to tell but I did see it move off the stop before it fired

 

Didnt drive anywhere in it today but it has fired right up every time to day out by my shop. About 6 or 7 starts

 

This sucks that you dont have confidence in your truck

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GSP7

GSP7

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Is there any external fuel leaking around the head? Injection lines or the return lines? Remember the return is at the back of the and can only be seen from under the truck.

 

 

 I re read this, Return lines are clean no leak,,, I was thinking about that,,, even if there was a return line that did have a leak it wouldnt effect starting... Agree?

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fire176969

fire176969

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Return line leaking will syphon the fuel out of the injectors causing extended cranking times. They can let air in the system without letting fuel out also, gives a way for air to get in allowing the fuel to drain back to the tank.

Edited by fire176969
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dave110

dave110

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Return line leaking will syphon the fuel out of the injectors causing extended cranking times. They can let air in the system without letting fuel out also, gives a way for air to get in allowing the fuel to drain back to the tank.

He's right, but yours does it when it's warm so I doubt it's a prime issue.

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