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Motor hesitation

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Old Aug 27, 2004 | 03:02 PM
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USMC64-70's Avatar
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From: Oxnard Calif
Unhappy Motor hesitation

Was driving down the road yesterday and the motor acted like it was starved for fuel. Stepped on accelerator nothing happened.

Thought it could be caused by bad fuel so put some new in the tank and it seemed to help. I had about 1/4 tank when this occurred. I changed my fuel filter 10,000 miles back.

Any thoughts?
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Old Aug 27, 2004 | 03:44 PM
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From: Seattle, WA
Change the fuel filter just for good measure. And also watch your tank next time it gets to 1/4 tank, if it does it again at 1/4 then you might have a hole in the tank pickup tube.
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Old Aug 27, 2004 | 03:49 PM
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Then again...are you sure your fuel gauge is reading correctly? It might be stuck reading 1/4 when it's actually empty.
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Old Aug 27, 2004 | 09:10 PM
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From: Montana
Originally posted by MikeR
Change the fuel filter just for good measure. And also watch your tank next time it gets to 1/4 tank, if it does it again at 1/4 then you might have a hole in the tank pickup tube.
This is quite common. There are some sharp tipped self tapping screws that hold the inner tank module together on '94 &'95s that are known to wear a hole in the pickup tube. This was fixed on later models. When you get in a high power demand situation the engine can actually stall from air lock. Either keep it above half tank or replace the module.
Luckily when it happened to me I was under warranty, module is around $300
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Old Aug 27, 2004 | 09:41 PM
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Don't want to seem dumb but what is a inner control module and what is it for?
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Old Aug 27, 2004 | 10:32 PM
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RCW
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Pull the fuel sender unit, and you will see the module attached to the inside. It is easy to replace the hose with a marine rated hose and save the cost of a new unit.

Your symptoms can be either the fuel intake hose in the tank, or the hoses from the tank to the hard lines that run to the engine, or where the hard lines stop and the hoses then run to the engine. All the OEM quality external hoses should be replaced every couple of years, and if you use marine grade replacements (marinas that service diesel boats have this hose on reels) they are good for five to ten years.

A leaking fuel heater electrical inlet is also a good candidate for your symptoms, as is a bad overflow valve.

All are reasonably inexpensive fixes.
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Old Aug 28, 2004 | 07:57 AM
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From: Montana
Originally posted by RCW
Pull the fuel sender unit, and you will see the module attached to the inside. It is easy to replace the hose with a marine rated hose and save the cost of a new unit.
Don't know how you can do this and have the module still work correctly as the hose inside the module is molded into a permanent spiral much like a self coiling air hose. It floats up and down with the fuel level so as to not pull fuel from the bottom of the tank.
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Old Aug 30, 2004 | 06:10 PM
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From: The 951-Flatbill center of the universe
Originally posted by infidel
Don't know how you can do this and have the module still work correctly as the hose inside the module is molded into a permanent spiral much like a self coiling air hose. It floats up and down with the fuel level so as to not pull fuel from the bottom of the tank.
I went through mine recently, had three hole worn in the spiral tube from rubbing on the aluminum part, which was loose. I cut the bad section out and replaced it with a short piece of hose I had left over from changing the rubber lines on the engine.

IIRC, the coiled tube is the return line, isn't it? It was connected to the smaller dia. elbow on top, and it's clipped into the body of the pick up assembly. Sits in a hole on the bottom, and it doesn't appear to me that it moves up and down at all.

The tube that runs down the center comes off of the larger dia. elbow on top, runs down to the float valve at the bottom, and it has a screen at the end. Looks to me like the float valve is there to keep the pick up from ingesting the garbage at the bottom of the tank when it's almost empty.....

I didn't see anything in there that looked like it moved with the fuel level except the level float......
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Old Aug 31, 2004 | 02:51 PM
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I just recommeneded this to someone else. Check the screen in the fuel pre-heater. Clean it, and put it back if it is dirty. IT is a very fine screen, and over 9 years, it could get clogged.
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