hard start at normal engine temp - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 07-18-2011, 04:01 AM Thread Starter
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hard start at normal engine temp

Just put on a new VP44 & FASS DDRP02 Lift Pump. Also addded big fuel line and all new banjo washers. New batteries and all relay and fuses are good. Truck cranked and ran fine for a couple of weeks. Starts great first thing in the morning. Drive 10 miles into town and turn off truck and go into store and come out few minutes later, got to crank 4 or 5 times before it starts. Fuel pressue gauge reads 18psi at idle and at 2000 rpms gauge reads 14psi. I have about gone crazy trying to figure out whats wrong on the hard starts when truck reaches normal operating tempature. Anybody got a solution?
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post #2 of 11 (permalink) Old 07-22-2011, 08:49 PM
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Try unplugging the FASS when its hot and see if it fires up like it should. This is a really common problem. I have been battling it for years. For a long time, I ran the FASS on an oil pressure switch, so that the fass wouldn't come on until the truck was running. This worked great, until I put on the twins and needed the spare oil port. Also, it made the FASS hard to prime during filter changes.

After that, I tried running a relay on a switch. So I could interupt that FASS signal during starting, but that didn't work too well. However, with the relay mounted in the ground line from the factory harness to the FASS relay. The increased resistance has caused it to work perfectly. And I suppose a resistor in that wire should do the same, but i don't know what size resistor is required. Hope this helps a little.
Sean

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post #3 of 11 (permalink) Old 07-27-2011, 02:18 AM Thread Starter
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sorry, late to reply. was out of town on business for a week. i will try your answer. might have to call you for advice on putting in the relay you talked about.
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post #4 of 11 (permalink) Old 07-29-2011, 01:46 AM
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definitely. If you call the number in my sig, you will get my buddies shop. It kinda slowed down so I haven't been in there. But you can shoot me a pm and I will help ya out or give you a call if you want and help get it figured out. I have no idea why the relay trick works, as the FASS retains all of its normal operating functions and it doesn't match up with the trouble shooting from the guys at FASS, but this trick has worked for me.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
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post #5 of 11 (permalink) Old 07-30-2011, 08:07 PM Thread Starter
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sstockton, i tried the unplug suggestion. did not work. now it is hard to start cold over night or when at normal engine tempature. any suggestions? everyone is telling me that i got a bad reman vp44. is that possible?
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post #6 of 11 (permalink) Old 07-31-2011, 03:07 AM
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very possible. That is where I would be looking. Or towards batteries and grounds. Bad remans, or having pumps fail electronically due to bad grounds is relatively common. Seems like a lot of pumps get blamed for other problems that result in pump failure though. Any possibility that air is bleeding back into the lines and you are losing prime?
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
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post #7 of 11 (permalink) Old 07-31-2011, 04:37 PM Thread Starter
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sstockton, i put a fuel pressure gauge on the oem fuel filter canister. with ignition off pressure reads "0". with ignition on and cranking pressure reads "18". as soon as i stop cranking and turn off ignition pressure drops back to "0". where would i look for the air that is bleeding back into the line. i have check the line several times for leaks but unable to find any. checked batteries they read 12.47 volts each and i added an extra ground strap.
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post #8 of 11 (permalink) Old 08-01-2011, 04:10 AM
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Have you noticed if the truck is any easier to start if parked and left facing down hill? Another common problem is a failed overflow valve that sticks open will allow the injector lines to bleed back into the tank when the truck has been shut off. If you park facing down hill, the engine will be lower than the tank and therefore will not bleed back. If this eliminates your starting issue you have found your culprit. Injector lines and connections at the head and with the crosshead transfer tubes are a good place to start looking for small leaks where maybe fuel may not be escaping, but air is getting back in.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
www.totalperformancediesel.com
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post #9 of 11 (permalink) Old 09-19-2011, 04:40 PM
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mine is doing the same thing and it just started about three weeks ago. I replaced the vp44 about 6 months ago. mine started doing it on really hot days say 95 to 100' f but it would be fine when the outside temp was cool even if the engine was at opporating temp but when the outside temp got up to around 80 or hotter it would begin to start hard its not a big deal but i'm really not looking forward to changing another vp44 lol
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post #10 of 11 (permalink) Old 09-19-2011, 11:53 PM Thread Starter
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hard hot or cold starts

well, after changing vp44 with one that was taken from another dodge donor. i had no leaks and the problem was a weak starter and really bad corrided battery cables. after puttingon new cables and reman starter, no more hard starts cold or hot. hope this helps.
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