transfer pump or fuel tank pump or ????
09-13-2013, 10:34 AM
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transfer pump or fuel tank pump or ????
I have a 1996 Dodge 2500 all stock. My situation: I fill my fuel filter with diesel and my truck starts and runs for about 45 sec, and then stops. I do a re-start and the engine just keeps cranking, but will not start. I check the bleed screw and yes there are bubbles coming out. I pump, I bleed and then try a re-start, it cranks but does not start. I refill the fuel filter with diesel, do a re-start and sure enough the engine fires up and runs for about 45sec and then stops. I do see some fuel coming through the banjo bolt when I loosen the one on top of the fuel filter. It seems that the fuel filter is not being filled up. Any ideas?
09-13-2013, 10:39 AM
#2
There should not be bubbles coming out of the bleed screw there should be fuel coming out of it.
You are not getting fuel to it so check your lift pump and fuel lines both at the IP and on top of the tank, a small leak will cause major problems in getting fuel to the engine.
When you manually depress the plunger on your lift pump does it pump fuel to the canister?
You are not getting fuel to it so check your lift pump and fuel lines both at the IP and on top of the tank, a small leak will cause major problems in getting fuel to the engine.
When you manually depress the plunger on your lift pump does it pump fuel to the canister?
09-13-2013, 01:02 PM
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The plunger seems to pump fuel to the filter, however I am not sure how to confirm.....except to say that when I depress the plunger I see more air bubbles coming from the bleed screw. I agree that I am not getting fuel to the filter.
would you know if this model would have a fuel pump in the fuel tank or is it just the transfer pump that gets fuel from the tank to the filter?
would you know if this model would have a fuel pump in the fuel tank or is it just the transfer pump that gets fuel from the tank to the filter?
09-13-2013, 08:44 PM
#4
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A 96 shouldn't have an in tank "pusher" pump.
You may have anything from a bad pick up tube in the tank to a bad/cracked/loose fitting at the lift pump/filter housing.
Inspect all fittings, lines and hoses from teh front to the rear and see if you can find any oily spots.
Welcome to the site!
You may have anything from a bad pick up tube in the tank to a bad/cracked/loose fitting at the lift pump/filter housing.
Inspect all fittings, lines and hoses from teh front to the rear and see if you can find any oily spots.
Welcome to the site!
09-14-2013, 09:59 AM
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thanks, will do. if the lines all check out, as they seemed to when I did my initial check, then I am thinking I need to replace the transfer pump? Should the transfer pump make any sounds when it is working? How obvious are the sounds given the normal purr of a cummins?
09-14-2013, 10:08 AM
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I am not sure on a 12 valve, but many do and will hopefully answer shortly...
Has your truck had any modifications, like an aftermarket fuel system, guages, intake, programmer etc?
Has your truck had any modifications, like an aftermarket fuel system, guages, intake, programmer etc?
09-14-2013, 07:28 PM
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no mods, just stock. if any can confirm if the transfer/lift pump should make sound when working, or what would indicate that this is my real problem, this would help with paying $235 for a new one. a reminder, my 96' only runs after I have filled up the filter, and then just for about 40sec. thanks in advance.
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09-16-2013, 10:38 AM
#8
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New OEM lift pump from Cummins or genosgarage.com is only about $100 but probably isn't the problem.
Sounds like an air leak on the suction side of the lift pump anywhere between the pump and fuel tank.
Read this> http://www.cumminsforum.com/forum/94...m-writeup.html
Sounds like an air leak on the suction side of the lift pump anywhere between the pump and fuel tank.
Read this> http://www.cumminsforum.com/forum/94...m-writeup.html
09-17-2013, 04:25 PM
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yes, it sure does, some call it a lift pump or a transfer pump and some even call it a fuel pump. I am thinking now that the only time it makes a sound is when the engine is running because I believe it works off the cam.
09-17-2013, 06:24 PM
#12
It should firm up after awhile when pushing the plunger meaning it has filled the filter up.....My guess is rotten rubber lines be SURE you use Diesel rated line when replacing it as most rubber hose will melt pretty quickly.....I prefer to use ONLY Coast Guard approved marine rated fuel line for diesel.
09-17-2013, 08:30 PM
#13
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The fuel pump primer is separate from the engine fuel pump. Two separate pumps in one. Check the fuel screen for restriction in the fuel heater, check fuel hoses for cracks, hookup fuel pressure gauge min pressure at idle 20 psi.
09-18-2013, 07:51 PM
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Thanks. I am now going to replace the gaskets and screen in the fuel heater, and the hose between the fuel heater and the lift pump. If this works then cheaper then replacing a lift pump, if not still makes good sense to do given cost. What might happen if I pump the lift pump with no fuel filter attached.....will I see fuel squirting out? If so, and without a gauge, should it be a fair bit squirting out? Thanks.