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1988 Chevy G20 van with rebuilt engine.
My gas milaege has always been 15-16 mpg and now is 10mpg.
I have had a tuneup done, fuel filter and fixed a vacuum leak. Runs slightly smoother but still 10mpg. Has new tires with all weather pattern but losing 5mpg?
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My first thought would be a vacuum leak in one of the hoses. Rubber hoses get brittle with age and even a small crack in a hose may cause surging. Happened to me in a Lumina.
my chevy full size van 5.7 litre has fuel coming from the fuel pump all the way to the engine but wont run. It will run if i put gas into the intake manualy. I put new relay and changed filter. fuel pump is working
We are assuming that you are talking about 1986 Chevrolet Truck G20 3/4
ton Van 5.0L 4BL OHV 8cyl... The
Fuel Filter is located under engine cover, center, upper engine area, rear
of alternator, mounted in fuel line.
sorry need to have a play with it to find the fault ,but if this vehicle is playing up why not go green and get yourself a nice peugeot partner van or a ford courier something with a nice 1.6 diesel engine ,50+mpg what more could you want .especially if your petrol prices were instantly risen to our europeon prices and the road tax set at our levels for engines this size
I would go over your basics
check fuel pressure
check fuel filter
check for spark
Low fuel pressure can cause all types of power problems. If all of them check out fine, I would check your exhaust converters for blockage.
Best do a fuel pressure test. Should have chg. fuel filter from the get go. The only other filter is on the end of the fuel pump in tank. Bad gas and dirty gas will plug up fuel filter, hense burn pump up.
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