[DeTomaso] Engine run anomalie

[boyd casey]

I just posted that I know have a spark indicator ( goes in line with the
coil or a plug and according to it I am getting spark but no combustion. I
am going to take off my cool air induction so I can quickly open the air
cleaner and see if it is squirting gas. I drove it to day with the gas cap
off to see if that was a contributing factor, it didn't make any difference.
Someone suggested a sticking fuel bowl needle. have you ever heard of a
holley 650 that stops working when it gets warm?Boyd

On Wed, May 13, 2009 at 7:50 PM, <forestg at att.net> wrote:

> Boyd,
> That should be enough fuel pressure. I'm leaning toward an ignition problem
> but here is what I would do first. The next time it won't fire stop, remove
> the air cleaner, open the throttle and see if the accelerator pump gives a
> squirt of fuel. If it does then start checking ignition system.
> Forest
> -------------- Original message from boyd casey <boyd411 at gmail.com>:
> --------------
>
>
> > I have been having a recurring problem with my car. It is a 73 L that is
> > not completely stock, Edelbrock intake, holley 650 w/ manual choke ,
> > MSD 6AL, MSD low profile distributor, MSD "blaster "coil, All the MSD
> stuff
> > is new including wires and new plugs. I have recently added a" Fram
> "racing
> > fuel filter, a small " inline" gas filter ( so I can actually see the
> gas),
> > a fuel pressure gauge. The problem is the car will start and run and seem
> > okay. If I only drive it around the block I never have a problem. If I
> drive
> > it a few miles I don't seem to have a problem ( Unless I turn it off)
> when I
> > turn it off it won't re start. I thought I had a fuel tank debris
> problem. I
> > have removed the fuel gauge sending unit, fuel out let twice
> > and completely drained and vacuumed the tank to pick up any debris. I
> didn't
> > find any evidence of any particulate mater and the brass screen at the
> end
> > of the fuel pick up is intact and did not show any signs of blockage. I
> have
> > noticed that when my engine won't start my fuel pressure gauge stays
> showing
> > 4.5 lbs of pressure( even though the engine is not running) that made me
> > think I had picked up some debris and that it was blocking the fuel inlet
> > and that the debris was being held in place by the vacuum created by the
> > fuel pump. I installed a vent line using a "T " connection from mu fuel
> > line between my fuel filter and the intake to the carb and another "t"
> > connection in the vent line. I put a small ball cock valve in this line
> so I
> > could release the vacuum and "drop" any debris being held by the vacuum.
> > This works but not immediately. The pressure on the fuel gauge drops to
> zero
> > but the car still won't start. usually after around 45 minutes the car
> will
> > start. It occurred to me today that perhaps the problem is not a clogged
> > fuel line but a blocked Vent line. If the gas tank is not vented won't
> that
> > create a problem as more and more gas is sucked out of the tank and the
> > vacuum build and since no air is entering the tank it becomes
> increasingly
> > difficult and eventually impossible for the stock mechanical fuel pump to
> > suck up any gas. Does this make sense? If this is the case is the remedy
> in
> > the gas cap or the vapor separator assembly Aside from the vent line that
> > terminates there the other connection on top of the gas tank? Also Since
> I
> > don't have the original air cleaner or any of the vacuum operated
> emissions
> > devices do I still need to keep the charcoal canister? The return from
> the
> > canister to the air cleaner no longer exists. My concern was that if the
> car
> > were to have the misfortune of winding up in an inverted position would
> the
> > vent line to the canister prevent fuel spillage. If not is there any
> reason
> > not to have the vent line open to the air instead of the cannister( which
> I
> > would like to remove it if is not serving a useful function.) If this is
> an
> > issue that can be remedy with a new gas cap do I have to buy a "pantera
> "gas
> > cap ,or is there a "normal " vented gas cap I can use?Thanks,
> > Boyd
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