6.9 rasing rpms NEED HELP
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Junior User
Joined: Mar 2016
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From: Perrysville ,IN
6.9 rasing rpms NEED HELP
The other day I started my truck (86 6.9idi) and it started normal and drove normal but it after about 20mins of driving it started ocasinaly reving up so I got home an put it in park and it idled down for a second than the RPMs started slowly raising then I shut it off then yesterday I drove it and it started doing it again only this time I drove longer and it died on the road like it was out of fuel cranked it for a while an it stsred again ran for a few miles than died again an so on, what is happening?
i ain't rite
Joined: Mar 2005
Posts: 65,625
Likes: 5,636
From: Marlboro Mental Hospital.
raising rpm's just before dying is the injector pump running out of fuel.
what i would try first is hooking up a portable fuel supply, like a boat tank to the lift pump. if it runs without any air intrusion, than i would move back to the fuel selector valve, keep moving back towards the tank until you find where it is sucking air.
then you know where to start looking, by eliminating the sections of fuel line where it was running good.
what i would try first is hooking up a portable fuel supply, like a boat tank to the lift pump. if it runs without any air intrusion, than i would move back to the fuel selector valve, keep moving back towards the tank until you find where it is sucking air.
then you know where to start looking, by eliminating the sections of fuel line where it was running good.
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Junior User
Joined: Mar 2016
Posts: 78
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From: Perrysville ,IN
Thankyou i was worried about it it's my first truck, im lucky enoph that the preivius owner put a electric fuel pump then about a 10" before the lift pump and the line from the tank to the fuel pump is new but the line from the electric fuel pump to the lift pump is not so it may be right their Thanks again for the information
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Lead Driver
Joined: Oct 2003
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From: Madison, WI
IIRC, it's a bad idea to run an electric fuel pump and the mechanical lift pump together. An electric pump should replace the mechanical pump.
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i ain't rite
Joined: Mar 2005
Posts: 65,625
Likes: 5,636
From: Marlboro Mental Hospital.
the problem running both is when you run the E-pump BEFORE the lift pump.
if the diaphragm in the lift pump fails it will leak fuel into the engine. if the diaphragm fails and there is an E-pump between the tank and lift pump, it will PUMP fuel into the oil pan.
the proper way to do both is to have the E-pump between the lift pump and the fuel filter. this way if the lift pump fails the E-pump can draw through it.
also, what style E-pump is it? the mr gasket style pumps are known for dying after a few years. even though they are called a diesel pump, they do not hold up for diesel use.
the proper pump to use is a facet duralift. it is designed for use in refrigerated trailers to pump fuel from the under hung tank to the reffer unit. i have seen them still working perfectly after 25 years of continuous use.
if the diaphragm in the lift pump fails it will leak fuel into the engine. if the diaphragm fails and there is an E-pump between the tank and lift pump, it will PUMP fuel into the oil pan.
the proper way to do both is to have the E-pump between the lift pump and the fuel filter. this way if the lift pump fails the E-pump can draw through it.
also, what style E-pump is it? the mr gasket style pumps are known for dying after a few years. even though they are called a diesel pump, they do not hold up for diesel use.
the proper pump to use is a facet duralift. it is designed for use in refrigerated trailers to pump fuel from the under hung tank to the reffer unit. i have seen them still working perfectly after 25 years of continuous use.
Thread Starter
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Junior User
Joined: Mar 2016
Posts: 78
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From: Perrysville ,IN
It's a facet duralift thankfully but it does come on at the turn of the key so it's on before the lift pump so I would assume to take it off and put it in between the lift pump and filter then I'll go from their thank you for your help I definitely don't want to put diesel in the pan
Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
This is what I would recommend also. If you want to remove the pump, a big block chevy block off plate fits with a little grinding. I made one out of a piece of aluminium I had layng around. Went to autozone and asked to see the mechanical lift pump, took the gasket out, made a tracing of it for a template.
Thread Starter
|
Junior User
Joined: Mar 2016
Posts: 78
Likes: 0
From: Perrysville ,IN
the problem running both is when you run the E-pump BEFORE the lift pump.
if the diaphragm in the lift pump fails it will leak fuel into the engine. if the diaphragm fails and there is an E-pump between the tank and lift pump, it will PUMP fuel into the oil pan.
the proper way to do both is to have the E-pump between the lift pump and the fuel filter. this way if the lift pump fails the E-pump can draw through it.
also, what style E-pump is it? the mr gasket style pumps are known for dying after a few years. even though they are called a diesel pump, they do not hold up for diesel use.
the proper pump to use is a facet duralift. it is designed for use in refrigerated trailers to pump fuel from the under hung tank to the reffer unit. i have seen them still working perfectly after 25 years of continuous use.
if the diaphragm in the lift pump fails it will leak fuel into the engine. if the diaphragm fails and there is an E-pump between the tank and lift pump, it will PUMP fuel into the oil pan.
the proper way to do both is to have the E-pump between the lift pump and the fuel filter. this way if the lift pump fails the E-pump can draw through it.
also, what style E-pump is it? the mr gasket style pumps are known for dying after a few years. even though they are called a diesel pump, they do not hold up for diesel use.
the proper pump to use is a facet duralift. it is designed for use in refrigerated trailers to pump fuel from the under hung tank to the reffer unit. i have seen them still working perfectly after 25 years of continuous use.
Could it pump diesel into the Pan when its running? Is that only when its not running?