Hello,
If you can put a fuel pressure gauge on the line to the carb it will
greatly shorten your trouble shooting time.
Typically an electric fuel pump should be mounted as close to the fuel
tank and as low as
possible. What you are describing could be vapor
lock trying to start. With our wonderful new fuel blends the fuel
will start to vaporize (boil) at lower temperature than the old fuel
blends.
If there is a restriction in the system such as a fuel filter on the
inlet side of the fuel pump that needs changing or fuel temperature is
higher due to higher warmer weather it can contrubute to your problem.
Personally I would not go back to the mechanical pump.
It is very important for safety that your electric fuel pump be wired
correctly. You should have the oil pressure switch that will turn off
the fuel pump when you don't have oil pressure. Wired correctly the
fuel pump runs while cranking the engine then when the engine is
running oil pressure keeps the fuel pump running. It is handy to have
a push button switch or spring loaded toggle switch to run the fuel
pump prior to
cranking to full the carb.
Take Care
Dennis C.
On May 28, 10:38 pm, Dave64 <
lt7d...@xxxxxxxxx> wrote:
> I've been having trouble with my poly running rough at idle. At higher RPMs it's been running just fine, though. After looking at the plugs and other basics, I replaced the fuel filter - just in case a chunk of crud got caught in it. I put a see-thru filter on it this time, and it ran really fine until I got it up to temperaure. Then the intermittent missing came back. This time I'm getting more of a bog at speed with harder acceleration, but better running at low end rpms. While undr the hood, I noticed that at times fuel seems to be just trickling into the filter - to the point of the filter having just a bit in it below the element. Other times the level of fuel is over the
top of the element - which looks more like it should. So I'm thinking the electric fuel pump may be starting to take a dump on me. This got me thinking - if I do end up having to replace it, why not put a mechanical pump back on? I'm interested in the
> group's opinions on mechanical vs electric fuel pumps on a stock Poly. By the way, I haven't eliminated the coil as the possible culpret to my problems, either, but the fuel flow running through the filter doesn't look adequate to me regardless.
>
> Thanks,
>
> Dave
> '64 Belvedere 2DHT
> 318 Poly, Push Button Auto
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