a friend has a 1999 dodge 2500. he has been have problems starting when the truck is at operating temp. the truck starts right up when cold, any ideas?

 

HARD START/LONG CRANK TIME AFTER A 10 - 60 MINUTE HOT SOAK, there are NO CODES and fuel supply pressure is good, problem is probably a defective injection pump. A way to confirm this is to duplicate the hard start condition, then (with the engine not running) cool the injection pump with a large quantity of water (e.g. use a garden hose). If the engine start better after cooling the injection pump, the pump needs to be replaced.

 

I had the same problem with mine. To much pressure at the IP while starting. Next time its hot, pull the fuse on the fass and see if it starts right up.
If thats the problem I will explain how to wire in a relay to fix it.

 

Can you explain to me how to do this? I have a 2000 with this problem.

Thanks

 

Get a 5 pin automotive relay, 30 or 40 amp. Most auto parts stores have them.
The pins are numbered 85,86,87,87a, and 30.
You have to cut the power wire feeding the pump. The end going to the pump goes to pin 87a. The other end to pin 30.
Pin 85 goes to ground
Pin 86 taps the starter solenoid wire. On my truck its the smaller wire running with the positive battery cable down to the starter. I tapped mine up top next to the battery box.
This will shut the pump off while your cranking the motor.
I had the hot start problem and this fixed it for over a year now.

 

had same problem injection pump was gone

 

I "sortof" had the same problem a couple years ago. Long crank after being warm.

Read something about a bad relay under the hood in the box. I switched out the fuel pump relay for the fog light relay (I am going from memory - this was 2 years ago) and haven't had a problem since.

Have no idea why that worked and haven't done any further investigation.

 

Slim,

Thanks for the help. I will file this away and try it next time I have this problem.