Intermittent stammer and fuel smell - Defender Source
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  #1  
Old March 7th, 2011, 09:11 PM
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Rob
92 RRC, 99 DII, 06 LR3, 09 LR2
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Intermittent stammer and fuel smell

So a month ago I replaced the ingnition amplifier module, the cap, the rotor, the vacuum advance (I knew it was bad), the plug wires and the vacuum lines thinking that one of these was causing a hot stall.

For a while it ran good, better even. Now I'm getting that stammer again under load. I drive long enough to warm it up (15-20 min) and it's usually after a period of driving in fourth approaching 3K rpm that I get the stammer. Feels like fuel starvation and then I smell gas. Letting off the accelerator and feathering the gas for a minute or two seems to keep it running and then all of a sudden it's gone. After that the truck runs fine the rest of the way to my destination.

I assume this issue is fuel related. So is it the fuel regulator, the fuel filter or the fuel pump?

What pressure should I have at the fuel rail?

Thanks!
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  #2  
Old March 7th, 2011, 10:39 PM
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Charles Galpin
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Is the gas cap holding pressure? Changed the fuel filter?
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Old March 7th, 2011, 11:20 PM
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Rob
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Yes. No not yet.
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Old March 9th, 2011, 10:27 PM
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Rob
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Exclamation

Bypassed the whole second gas tank switching valve set-up returning it to stock w/ a new fuel filter, checked pressure at regulator and even replaced coil. Still stalling out when warmed up. I've also replaced ign amp module, cap, rotor, wires, vacuum advance and all vacuum lines.

What the hell is causing this problem?!

ECU?
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Old March 10th, 2011, 03:42 AM
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Tony Sims
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Dirty MAF? Dirt in the fuel rail? Dirt in the fuel pump? Dirt in the tank clogging the fuel pickup? Leaky line from the tank? Leaky injector seals? Water in the fuel?

Stop replacing electrical components and do some diagnosis on the fuel supply.
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Old March 10th, 2011, 08:17 AM
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Charles Galpin
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To be fair he has looked at the fuel supply. I'm not sure how you are checking the fuel pressure, but can you check when it's warmed up too? Maybe the fuel pump is failing.
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Old March 10th, 2011, 09:39 AM
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Checked the fuel pressure with a guage at the regulator when it was warm. Siphoned some gas from this location (after the filter) and there were no excess bubbles - indicative of fuel pump issues and no visible debris in the fuel. This truck has had some mods with an unfinished project - (by previos owners) ROW additional fuel tank added under the pass seat and a six way bypass valve with two fuel filters - all of which was removed last night. There are no leaks or water in the fuel.


All components replaced thusfar were suspect given age/condition and would have been replaced anyway.

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