[DeTomaso] Engine run anomalie

[Steve Hawkins]

You may be boiling the gas out of the carburetor when it's hot and thus have
to crank longer to refill the carb.  Do you have a carburetor spacer under
the carb?

Steve

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of boyd casey
Sent: Wednesday, May 13, 2009 7:02 PM
To: forestg at att.net
Cc: detomaso at realbig.com
Subject: Re: [DeTomaso] Engine run anomalie


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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