Leyland P76 Owners 2006

Technical

Carbie Problems

215V8 Yahoogroups

-----Original Message-----
On Behalf Of Bill Haughton
Sent: Tuesday, April 01, 2008 5:36 PM
To: 215V8@yahoogroups. com
Subject: [215V8] Starved for fuel
I am having problems with my fuel system and can't be sure if it is flooding or starving for fuel.
Here is the long story about it.
Put a new/used 4V carbie on the car.
I was told the carbie had been on a running 215 and was in good shape, I trust that the carbie is ok.
Had problems getting the auto choke to function but eventually sorted it out to the point where the car would run.
The car then started shutting down when I would do speeds of 60 - 70. Then got progressively worse.
Thinking that I probably had trash in the 45 yr old tank, I dropped the tank only to find that all was in pristine condition with the fuel pick up and inside tank.
Put a new fuel pump on and changed the fuel filter in the sediment bowl style filter.
While changing the filter I found not only the old filter but what looks like the top of a previous filter.
The top part I found looked like a solid gasket with little holes punched in it just like the top of the new filter. Logic told me that if I left the top part in there then I would somehow have to align those holes.
So I took that part out and put in the new filter.
Performance was improved except every time I stopped the engine would flood while trying to start it.
Also there was a hesitation when accelerating.
I checked the timing it is right on the money.
While driving the car it died on me.
I managed to start the car and happened to look at the filter.
The bowl was not full and it looked as if I was getting air bubbles into the filter.
Then the bowl filled up and the car died.
Now gas was flowing from the carb.
I again get the car started and later I see air in the filter, eventually got home.
I have bought new fuel hose and am in the process of replacing all hose from tank to carb.
Did you know that the fuel line hose from the tank over the rear end to the hard fuel line is almost 5 feet long!
When you buy 5/16 hose to replace the hoses, buy at least 8 feet. Unreal.
Has anyone experience anything like this? Any ideas what could be going on?
I figure I got an air leak in the line from the tank to the pump and hopefully when I get the last piece of hose replaced it might run right.

Replies

"Mike Peissner"
wrote:
Bill,
If you are seeing bubbles in the sediment bowl, I usually means that is an air leak somewhere between the tank pickup and the pump OR in the pump itself.
Look carefully at all the hose connections and the metal tubing used for the pickup.
I have seen a pinhole leak cause by corrosion when water collects in a top mounted fuel gauge sender unit.
Also, look for possible restrictions in the fuel line as well.
A restriction will cause the pump to "suck hard".
This can make even a small air leak worse AND not be able to draw in enough fuel for a sustained highway run (even if it is fin around town).
Finally, remove the filter in the fuel bowl and replace it with a see-thru in-line filter between the pump and the carbie.
It will tell you a lot more about the fuel going into the engine.
(You might also consider an inexpensive in-line fuel pressure gauge at the same time.)
http://store.summitracing.com/partdetail.asp?part=SPE%2D59013
Mike
San Diego

Reply

Garry
wrote:
Bill, I agree with your theory and with Mike.
Sucking up air with the gasoline sounds most plausible.
When you got up to higher speed when the fuel demand was highest, you didn't have enough.
Initially it sounded like you were losing vacuum with the butterfly open, but you did a good job providing all the information around the areas that I would have asked about.
The flooding sounds like a second problem to me.
A funnel and clear fuel line held over the carbie with the engine off could verify the float is not shutting off flow when the bowl is full.
This will get worse after you identify and fix the cause of the fuel flow delivery shortage.
Gar
Last updated
April, 2008
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