Fuel Delivery Problem/Fuel Pump Rod

[RandalPark@xxxxxxx]

Based on my own experience, if the engine that you are working on has less then 
200,000 miles on it, there shouldn't be a problem with this rod, and maybe not 
even then. I have 5 Imperials with 413's. All of them have had fuel problems 
ranging from worn out pumps, bad carburators, and dirty tanks, lines, and 
filters. I never ran across a problem with this rod. Two of those cars have 
over 200,000 miles on them.

If everything else in your fuel system is within spec, new, or replaced, and 
your car still doesn't run correctly I would tend to suspect an ignition 
problem. Ignition problems and fuel problems mimic each other in symptoms of 
poor performance. 

Back to the fuel system, though, I have one car that had a partially clogged 
fuel delivery line from the tank. Although it appeared that everything was 
working right, the amount of gas traveling through the line was not sufficient 
to supply the engine properly. The fuel filter was suspected, but replacing it 
repeatedly had no effect. The result was misfiring at higher RPMs, and, in this 
case, seemed more like an ignition problem. Finally, the clog broke free and 
made itself obvious by clogging the new fuel filter and stalling the engine. 
Once the filter was replaced, the car ran like a champ.

Sorry about the "back and forth" but like I said, symptoms of problems with 
these two systems are difficult to separate. If the engine oiling system was 
ever badly clogged, or if the engine was "cooked" there would be a chance that 
the fuel pump rod was damaged, but not really very likely.  

Paul

In a message dated 9/12/2004 8:44:04 AM Eastern Daylight Time, 
<pbrust@xxxxxxxxxxxxxxxxxx> writes:

>The fuel pump on big block Mopars is driven by a short push rod. Over the 
>years, this rod becomes worn and eventually results in poor performance of the 
>mechanical fuel pump. I checked the 1964 Manual and couldn't find a spec for 
>the rod so I'm reduced to identifying a possible problem while lacking the 
>ability to define it. 
>
>Phil Brust
>73 & 82 Imperial
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