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?

Gamble,,, Sorry,,, You could be right about the starter motor.

 

I have new batterys, and ever since I but them in I was thinking it seems like my starter should crank faster RPM with those new batterys.

 

  So I was at a local diesel truck shop, and had the guy listen to it crank for his opinion. He said yeah it should crank faster,,, sounds like its drawing a ton of amps

 

The starter might not be spinning the motor fast enough to get proper injector pump pressure to fire it up

 

   Good news... I have a Napa lifetime warranty on this starter (rebuilt) and found my receipt.... Called Napa and I can get a new one free !!!!

 

Free parts is Good !!!!  They also Have a New Starter $10 more with lifetime warranty, Its made in china, though Im told they have had good luck with them

Edited March 18, 201510 yr by GSP7

Hey Mopar1973Man,  could this not be a cracked diaphragm on the vp???  I had the same issue and did the relay you suggested and it fixed it.  Of course, it's only a temporary fix for a failing vp but nonetheless I've been running mine for almost 2 years with the relay.  Granted the pump is on it's last leg now and I'm about to replace it but it saved me some money in the long run.  I tried to find the write up on the wiring diagram but was unsuccessful.  Try this GSP7 and you will find out if it's your vp or not and maybe get a little more out of it before replacing it.

Actually the hard start hot is excessive cranking pressure not cracked diaphragm. The 027 REV pumps should not have a diaphragm but a hard steel plate nothing to crack. But the problem is during cranking if the pressure is over about 12 PSI the VP44 gets over advanced and has a hard time starting. Optimal cranking pressure should be between 7-10 PSI. Really common for people with aftermarket pumps with adjustable regulators and they crank them up way too high trying to keep the WOT pressure above 14 PSI so there idle is way up at 20-22 PSI and cranking pressure ends up well above 15 PSI.

Mopar Man , good point about over LP pressure to the VP at start. Guy at Blue Chip mentioned that when I talked to him

 

Starter Motor !!!!...... I just replaced mine this morning. Another Napa Reman. lifetime warranty one. Napa tested my old one and it was drawing too many amps ..Bad....

 

The New Starter installed cranks alot faster....We will see if this cures my long crank issue I have had off and on for 2 years. Best part is it cost me $0.00.

 

I got the Napa Rebuilt one, Not a New made in China one. The rebuilt one is done in Mexico and I hope maybe it is a Denso core. Id rather have that than a new chinese one

 

Thanks Gamble for Posting about the Starter....After I thought about it , I remembered I did think that my starter seemed slow even after I just put in new Batterys

 

Rick

Edited March 19, 201510 yr by GSP7

Rick,

Hopefully it does the trick for you, I know mine has been good as gold since the rebuild.