Help! Loosing prime? - Competition Diesel.Com

Ludgate124 · 03-25-2017, 06:03 PM

Just got my 02 12 valve put together and if I let the truck sit for a few hours and go to start it I have to crank for 30-60 second before it will start

After it is running it will start right up again

Truck has new 215 from FDS
New 5x.018 injectors from haley
New ofv060
All new fuel lines

No visible leaks thanks

Stox5225 · 03-25-2017, 08:13 PM

Sounds like an air leak to me! Park the truck facing down a hill and try it again. If it starts, then you got an air leak somewhere.

Sent from my iPhone using Tapatalk

Rich dzl · 03-25-2017, 08:51 PM

Does it have a stock lift pump or a fass/airdog

jasonc · 03-26-2017, 07:53 AM

I assume an electric lift pump since your running an 060ofv. If not thats your problem. I had the t-tech ofv with just a bleed hole and an airdog, went back to the stock mech pump when the AD failed and had to go back to a stock type ofv with the spring and check valve or it would loose prime after it sat.

Levi_plummer · 03-26-2017, 08:23 AM

Are you farmiliar with modified p-pumps? Every one I have been in with governor springs you have to give it a little throttle to get them running.

jasonc · 03-26-2017, 10:12 AM

Quote:

Originally Posted by Levi_plummer

Are you farmiliar with modified p-pumps? Every one I have been in with governor springs you have to give it a little throttle to get them running.

The haisley 5ks when set up correctly crank with a bump of the key like stock.

YOUNG GUNS15 · 04-14-2017, 08:15 AM

Quote:

Originally Posted by jasonc

The haisley 5ks when set up correctly crank with a bump of the key like stock.

Yes! I love the way my pump runs with those springs. Bump starts are amazingly satisfying on a heavily modified 12 valve!

Also in the first post he mentioned the 215 was built by FDS which I'm assuming means Farrel Diesel Service. So the pump is probably not the culprit. X2 on the overflow valve. That is the easiest place to check first. Then check lift pump, lines, delete the fuel heater if it has one. Make sure the fuel vent is functioning etc.

03-25-2017, 06:03 PM	#1
Ludgate124 Name: Ludgate124 Title: Green Behind the Ears Status: Not Here Join Date: Apr 2013 Member`s Gallery Posts: 57	Help! Loosing prime? Just got my 02 12 valve put together and if I let the truck sit for a few hours and go to start it I have to crank for 30-60 second before it will start After it is running it will start right up again Truck has new 215 from FDS New 5x.018 injectors from haley New ofv060 All new fuel lines No visible leaks thanks

03-25-2017, 08:13 PM	#2
Stox5225 Name: Stox5225 Title: Green Behind the Ears Status: Not Here Join Date: Nov 2016 Location: Lillington, NC Member`s Gallery Posts: 97	Sounds like an air leak to me! Park the truck facing down a hill and try it again. If it starts, then you got an air leak somewhere. Sent from my iPhone using Tapatalk __________________ 1997 Cummins 2500; NV4500HD; SB DD; 315/75R16; 3rd Gen Track Bar; 63/65/14; AFC Live; 7mm DV's; 4 GSK; Mac Rack Plug; Custom Fuel System; 5x.012; Colt Cam Big Stick; 60# Springs; PDD Stage 1 Push Rods; O-Ring Head; Head Studs; Fluidampr; Boost/EGT/FP Gauges

03-26-2017, 08:23 AM	#5
Levi_plummer Name: Levi_plummer Title: Too Much Time Status: Not Here Join Date: May 2012 Member`s Gallery Posts: 346	Are you farmiliar with modified p-pumps? Every one I have been in with governor springs you have to give it a little throttle to get them running. __________________ 92 W250 sclb. "Jinny" 962/1472. 7.08@98mph RIP.. 96 sclb 4x4 new racetruck in the making 97 sclb 4x4 tow rig

03-25-2017, 08:51 PM	#3
Rich dzl Name: Rich dzl Title: 12v guru Status: Not Here Join Date: Mar 2011 Member`s Gallery Posts: 741	Does it have a stock lift pump or a fass/airdog

03-26-2017, 07:53 AM	#4
jasonc Name: jasonc Title: Too Much Time Status: Not Here Join Date: Nov 2009 Member`s Gallery Posts: 4,412	I assume an electric lift pump since your running an 060ofv. If not thats your problem. I had the t-tech ofv with just a bleed hole and an airdog, went back to the stock mech pump when the AD failed and had to go back to a stock type ofv with the spring and check valve or it would loose prime after it sat.