HOT start 180HP engine

My carbureted Hawk gets by fine on gravity feed. I am still trying to understand the need for the pump. Of course you have to have
one on fuel injection. Maybe they add it instead of making the fuel lines larger?

Mike Z (still puzzled)

"Ross Richardson" wrote in message ...
My '65 C-172 with the 180 conversion also has a fuel pump installed.

Ross

"Mike Z." wrote:

I have a stupid unrelated question.

Why do you have a fuel pump on a '73 carbed 'Hawk?

I assume it is related to the 180 upgrade and I ask because I have that in the back of my mind for overhaul time.

Mike Z

"Hankal" wrote in message ...
My 1973 Skyhawk has the 360/180 hp engine carburated.
When the engine is hot it is difficult to start.
My procedure is master switch battery side on, fuel pump on. Prime throttle 3
times. Fuel pump off, turn starter while advancing the throttle.
Today she would not fire and the battery went south.

Any recommendations, suggestions.
Will check timing and Magnetos tomorrow.
Hank N1441P

"Mike Z." wrote:

I am still trying to understand the need for the pump.

It's quite likely that the only need for the pump was that it was significantly
easier to get the STC for the engine with a fuel pump than without one.

George Patterson
Treason is ne'er successful, Sir; what then be the reason? Why, if treason
be successful, Sir, then none dare call it treason.

Tell me about it. We now have three fuel pumps on our Cherokee. The autogas
STC replaces the original electric backup with two other electric backups, and of
course there's the mechanical engine pump. Yet another instance of what's legal isn't
necessarily safe, and what's safe is not necessarily legal. I'm sure it's mostly a
paperwork thing as CYA from a marginal original design.

-Cory

G.R. Patterson III wrote:
: "Mike Z." wrote:
:
: I am still trying to understand the need for the pump.

: It's quite likely that the only need for the pump was that it was significantly
: easier to get the STC for the engine with a fuel pump than without one.

: George Patterson
: Treason is ne'er successful, Sir; what then be the reason? Why, if treason
: be successful, Sir, then none dare call it treason.

--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
************************************************** ***********************

It's best just to go rich( a hot start, not fuel
injected) and crack the throttle,
crank a half a dozen blades, should start if engine is OK.

Snip.
The plugs were cleaned and gapped,
Checked timing, Left mag was off by 4 degrees.
Cold start fired up on 3rd revolution.
Once the engine was hot, I had mixture rick, cracked throttle and she would not
start. Waited 2 minutes, Pumped throttle once and she started on the 3rd
revolution.
Problem solved?

I have a stupid unrelated question.

Why do you have a fuel pump on a '73 carbed 'Hawk?

I assume it is related to the 180 upgrade and I ask because I have that in
the back of my mind for overhaul time.

Simple answer, it has the Avcon Conversion

When my Cessna 172 gets hard to start, hot or cold, I replace the
coil in the impulse mag with a NEW coil. This has always fixed the
problem. (This has worked three times in the last 15 years.)
I have found that the coils in rebuilt mags may not be the best
either.
John

On 28 Mar 2004 22:32:48 GMT, (Hankal) wrote:

My 1973 Skyhawk has the 360/180 hp engine carburated.
When the engine is hot it is difficult to start.
My procedure is master switch battery side on, fuel pump on. Prime throttle 3
times. Fuel pump off, turn starter while advancing the throttle.
Today she would not fire and the battery went south.

Any recommendations, suggestions.
Will check timing and Magnetos tomorrow.
Hank N1441P