Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Hard to start help


Recommended Posts

So I have a 1976 square tail 

current set up is: 

38/38 Weber 

292 cam 

fresh plugs, rotor, cap. 
stock exhaust 

electric fuel pump 3.5psi no regulator 

otherwise mostly stock 

my current issue is that after the car sits for any period longer than 30 minutes it’s start or restart is very laborious. Once started and warm it runs wonderful. This began after installing the bigger cam. 
 

I have also adjusted choke settings and dialed in lean idle settings. 
 

Any tips appreciated! 

Link to comment
Share on other sites

Do you have a fuel return circuit connected to your electric pump?

This will circulate (cool) the fuel in the lines to help prevent vapor lock. It will also allow you to lower your fuel pressure a bit depending on the return line orifice size.

The Ethanol in fuel starts to boil at 178 degrees F.  When your car sits (with the hood closed) after a drive, the carb can easily reach 185 degrees F which causes percolation and vapor lock.

 

Solutions:

- Fuel return line to keep fuel cool. Run electric pump for a few seconds before starting.

- Phenolic block between the carb and intake manifold.

- Reflective heat shield (aluminum duct tape) under float bowl and air cleaner. 

- Keep fuel lines and filters away from heat sources (head, coolant lines, etc.).

- Fresh, cool air to carb from outside the engine bay.

- Check condition of all fuel lines. No air leaks!

- Try to use "real" gas ... no Ethanol! (If you can find it).

 

John

 

Link to comment
Share on other sites

With an automatic choke, at least in theory, a single pump of the accelerator pedal (when cold) should be enough to "set" the choke--i.e. close the choke flaps and position the fast idle.  To see if that is happening with a single pump, on a cold engine, pull the air cleaner top and floor the accelerator once.  If it sets, that's all you need to do, because every pump of the pedal squirts more fuel into that cold manifold via the accelerator pump, and all that gas is gonna flood the engine.  

 

With my manual choke, I've learned that when cold, I pull the cable all the way out to set the choke, and hit the starter without touching the accelerator pedal.  And it starts right away.  

 

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Supporting Vendors

×
×
  • Create New...