Check timing... A too far advanced timing will cause the sputter (or "dieseling") of the engine. Also, cheap gas will do that....on occasion.
What's wrong with the carb? What made you change the fuel pump out, and did you replace a stock unit with a stock unit, or what? We're gonna need as much info as possible, like: what's the car and engine, for starters. It would also be nice if you knew your fuel pressure...
sputter Hi phd (whats your name? we're friendly here) - timing check is a whole lot cheaper than a new carb....check that first. I do not understand why a new fuel pump made a difference though. Why did you replace it, and was it doing the "run on" with the old pump? What car is this on? - Bill
Hi, my names is chris and thanx for trying to help me. I put a new fuel pump, because the piece were the aluminum hoes connects to on the pump was cracked and leaking gas. I replaced it with a stock fuel pump. My motor is a 350 2 brrl, 4 dr, 1970 buick skylark. Im going to put a pic of my car soon. What do I need to check the fuel pressure. I going to get the timming checked and I`ll let you guys know and tell me what you think I should do next.
Don't have a pro check the timing- it's simple and easy to do it yourself Get an iductive timing light (I don't think you can get anything BUT an iduction type one these days). Cap off the vacuum advance port on the carb and the distributor. Hook the light cables to the battery, and the induction clip over the #1 spark plug wire. With the car at idle and parked, point the light at the area of the bottom pulley (crankshaft pulley) on the engine- you'll see a "timing tab" over the large ring type thing attached to the bottom pulley- that's your harmonic balancer. The balancer has a line on it. What you do is point the light at the tab and pull the trigger- this will strobe the light in time with the firing of the #1 cylinder and the light will illuminate the tab AND the line on the balancer- the line on the balancer is a pointer to the tab. Whereever it points is your initial timing. Probably should be 8 degrees advanced for the factory setting, but I haven't had a 350 for so long I might be wrong.
Thanx for the advice, now I could save some dollars. My friend said he has a timming gun. I`ll get back to ya Thanx!
Chris, over the years I have found a combination of things cause run-on. 1. what is the state of tune? Sparkplug-points age and condition. 2. Dwell on point systems, timming. 3. Carb adjustments. Both mixture and speed.Some cars in the 70's had a solenoid hooked up to the throttle and used it to set the idle speed. When the engine was shut off the solenoid collapsed and closed the throttle completly. Hope this helps. Walt
