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 start when warm then gas smell


ChuckR

Recommended Posts

hi, i did search several key words to see if this was covered - some close but ultimately not helpful. here is my situation: i have a standard '69 02, 2 yr old Weber 32/36 with CDs prescription on jetting, car is tuned well with all decent wires, plugs, new pts, timed right. car runs like a champ. recently been intermittently hard to start when warm, cranks and cranks, then slowly catches, then gas smell, then runs fine, never any gas smell otherwise and starts fine most of time on the 'button'.

i've done a visual inspection, don't see any gas leaks, looked when running, no leaks.

any suggestions?

thanks, Chuck

1969 Colorado Automatic (converted to 4spd)

1982 528e
1972 BMW R75/5

chuckrouthier.com

Link to comment
Share on other sites

ignition points are fine in my book -

BUT DWELL meter is the best way to adjust the gap-

ton's more accurate (and motor runs better!)

than using a 0.015" feeler gauge method

idle speed mixture make a differance also

...and valve adjustment (if too tight - that will cause some gas smell ?)

and also unburned gas during long cranking will cause added stink

'86 R65 650cc #6128390 22,000m
'64 R27 250cc #383851 18,000m
'11 FORD Transit #T058971 28,000m "Truckette"
'13 500 ABARTH #DT600282 6,666m "TAZIO"

Link to comment
Share on other sites

hi creighton, thanks for input, i do use a Dwell Meter for sure. i had checked the valves about 6 mo ago, but will do again. i also had what i thought was a lean condition this winter, so i did make idle mixture richer...i'll look at that.

thanks, chuck

1969 Colorado Automatic (converted to 4spd)

1982 528e
1972 BMW R75/5

chuckrouthier.com

Link to comment
Share on other sites

in the carb--if the float has gas in it and/or the needle valve doesn't seal properly, fuel will be forced past the needle valve when the hot engine is at reast (gas expands when hot), causing the excess fuel to overflow the float chamber and run down the carb throat. This'll cause hard starting and a gas smell.

I've had floats (plastic and brass) sink with all hands on board at least three times on three different cars/carb makes over the years. When the float sinks you won't be able to start or run the engine due to flooding, but one that rides low will still allow eventual starting.

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

Could be hot flooding-

Jenn's car does this,

and can be hard to fix. Especially if you use an electric

pump that holds pressure when it's off.

What happens is that the float valve is either slightly leaky

OR fuel pressure builds too high in the system. When you shut down,

the float bowl overfills, and floods the carb- the easiest

way to diagnose this is if a WOT hot start works a lot better

than just trying to start it normally.

fwiw,

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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...