What Tim said. If the lines are disconnected under the hood, put the larger in a can. Leave the return alone. Ground out a battery to the car, and run a pos wire from battery to the to a fuel pump test. It will be a single wire with a connector by itself on the rear of the inner fender, behind the fuse block on the passengers side. Make sure someone is holding the fuel line in what ever container you use. 45 psi will shoot a good distance.picture
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1980 Cadillac Coupe DeVille. 6.0 87k
2017 Chevrolet Silverado LT 4.3 Aluminum V6 (My daily)
2008 Saab 9.3 convertible (Wife's Daily)