Low Fuel Pressure!!!!!!
11-06-2006, 11:16 PM
#16
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More info please, I'm experiencing the same symptoms, 16 psi idle down to 10 idle for no reason. yes I have an isolator but I re-bled the entire thing this weekend and new fuel filter same symptoms, couldn't get new fuel fittings on a Sunday in this one horse town for the needle valve I bought to get rid of the isolator.
Thanks
Thanks
Take notice to the opening pressure listed for the overflow valve... You might want to download this FSM manual to read too...
CLICK TO DOWNLOAD
11-07-2006, 04:27 PM
#18
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)Now what you got to do is figure out if the LP is on the engine or in the tank...
11-07-2006, 07:22 PM
#19
OH, I guess I'm OK.
I've just ordered a Glacier Set-up, now I'm needing to find someone that needs a pair of new campaign LPs. $64.90 per (I need to remove one).
No more LP BLUES, problem solved...!
pc
I've just ordered a Glacier Set-up, now I'm needing to find someone that needs a pair of new campaign LPs. $64.90 per (I need to remove one).
No more LP BLUES, problem solved...!
pc
11-08-2006, 09:13 PM
#20
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if i was planing on keeping mine, id do the draw straw, big line kit with holly blue..........but im not, so i just want to fix it like it will work right, with out screwin over whoever buys it. 
11-09-2006, 01:39 PM
#21
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Anyone where you can get a overflow valve? I removed and bypassed my stock lift pump, just have the carter 4601HP mounted on the frame. Still only getting 8psi at idle (used to get 15) so guess it may be the overflow valve.
11-09-2006, 05:41 PM
#22
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Originally Posted by Dodge FSM - How to Diagnose Overflow Valve
OPERATION
Fuel volume from the fuel transfer (lift) pump will always provide more fuel than the fuel injection pump requires. The overflow valve (a check valve) is used to route excess fuel through the fuel return line and back to the fuel tank. Approximately 70% of supplied fuel is returned to the fuel tank. The valve opens at approximately 97 kPa (14 psi). If the check valve within the assembly is sticking open, fuel drainage of the injection pump could cause hard starting.
DIAGNOSIS AND TESTING - OVERFLOW VALVE
Fuel volume from the fuel transfer (lift) pump will always provide more fuel than the fuel injection pump requires. The overflow valve (a check valve) is used to route excess fuel through the fuel return line and back to the fuel tank. Approximately 70% of supplied fuel is returned to the fuel tank. The valve is located on the side of the injection pump (Fig. 59). It
is also used to connect the fuel return line (banjo fitting) to the fuel injection pump. The valve opens at approximately 97 kPa (14 psi). If the check valve within the assembly is sticking, low engine power or
hard starting may result. If a Diagnostic Trouble Code (DTC) has been stored for “decreased engine performance due to high injection pump fuel temperature”, the overflow valve may be stuck in closed position. A rubber tipped blow gun with regulated air line pressure is needed for this test.
is also used to connect the fuel return line (banjo fitting) to the fuel injection pump. The valve opens at approximately 97 kPa (14 psi). If the check valve within the assembly is sticking, low engine power or
hard starting may result. If a Diagnostic Trouble Code (DTC) has been stored for “decreased engine performance due to high injection pump fuel temperature”, the overflow valve may be stuck in closed position. A rubber tipped blow gun with regulated air line pressure is needed for this test.
(1) Clean area around overflow valve and fuel return line at injection pump before removal.
(2) Remove valve from pump and banjo fitting.
(3) Discard old sealing gaskets.
(4) Set regulated air pressure to approximately 97 kPa (14–16 psi).
(5) Using blow gun, apply pressure to overflow valve inlet end (end that goes into injection pump).
(6) Internal check valve should release, and air should pass through valve at 97 kPa (14–16 psi). If not, replace valve.
(7) Reduce regulated air pressure to 10 psi and observe valve. Valve should stay shut. If not, replace valve.
(8) Install new sealing gaskets to valve.
(9) Install valve through banjo fitting and into pump.
(10) Tighten to 30 N·m (24 ft. lbs.) torque.
(2) Remove valve from pump and banjo fitting.
(3) Discard old sealing gaskets.
(4) Set regulated air pressure to approximately 97 kPa (14–16 psi).
(5) Using blow gun, apply pressure to overflow valve inlet end (end that goes into injection pump).
(6) Internal check valve should release, and air should pass through valve at 97 kPa (14–16 psi). If not, replace valve.
(7) Reduce regulated air pressure to 10 psi and observe valve. Valve should stay shut. If not, replace valve.
(8) Install new sealing gaskets to valve.
(9) Install valve through banjo fitting and into pump.
(10) Tighten to 30 N·m (24 ft. lbs.) torque.
As for where to get one at I would try NAPA.. But then Cummins then Dodge Dealer... In that order too...
11-19-2006, 09:13 PM
#28
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well i replaced the valve it was $30 form interstate injection. and it didnt fix my problem.....i borrowed a almost new campagin pump(off a buddys truck that got a fass) and same thing idle around 6-8 and below 1psi at 1500 and the gauge is about where -3 should be at wot
11-20-2006, 08:40 AM
#29
Do you have a bad flex hose (collasped) or a kink in a line. Remove the line from the tank and check it and the assembly in the tank for problems.
Something is getting in the way on the vacumn side of the system.
Also check your voltage going to the LP pump and insure the connection is clean and solid.
I have a Vulcan Big Line LP Kit (new in box) if you think you need it.
Good Luck,
pc
Something is getting in the way on the vacumn side of the system.
Also check your voltage going to the LP pump and insure the connection is clean and solid.
I have a Vulcan Big Line LP Kit (new in box) if you think you need it.
Good Luck,
pc
as much as i hate to. and see what the deal is.
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