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Old July 11th, 2018, 19:59   #1
sgriff144
Member
 
Join Date: Feb 2010
Location: pittsburgh
TDI(s): 05 passat
Default B5 Hard Warm Start

I know this is a topic that has been discussed on here before, but still having an issue troubleshooting.

Other week with car up to temp and low on fuel (less than 1/8 tank), I stopped to fill up at reputable diesel station. Car started routine after filling and went to hardware store 5 miles away. Approx 20 mins later I come out and car would crank, but not start/attempt to fire.

Got ride home and came on here to look at possible causes. Went back to store, took apart intake to ensure ASV was not closed, it was not the foreseeable issue. Attempted to crank car again for lack of better things to do and it started.

So...car starts fine when cold. Will start after warm if only sitting short period. Greater than approx 20 minutes will crank for extended period. Car will start with starting fluid, I do realize this is not advised. No codes on OBD2 and my vagcom is out on loan. I have replaced coolant sensor as I read this might be an issue with warm starts, still not improved. I clamped hoses on both sides of the check valve on fuel filter and thought warm starts were better. However, I replaced the valve with one from ID parts and I am still having issues. Also replaced the fuel filter. I have also read about crankshaft sensor being a cause for hard starts, but my tach needle raises off zero when cranking engine.

Seems like it is obviously a fuel delivery problem (car starts with ether) I can't help but wondering if I ended up with bad fuel or complications from fuel level being much lower than I normally let it fall before filling up. Fuel pump seems to be audible from the back when turning the key to "on."
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