UPDATE 2-Sunoco shuts Midwest crude pipeline after spill

(Adds Marathon comment, Sunoco comment, details of crude leak.)

HOUSTON Feb 19 (Reuters) - Sunoco Logistics (SXL.N) shut a 142,000 barrel a day crude pipeline linking Ohio to Michigan after an oil spill at the line's pump station in Cygnet, Ohio, Sunoco (SUN.N) said on Thursday.

The Maumee pipeline was shut down in the late afternoon Wednesday and it was unclear when it would restart, a Sunoco operating official in Houston said.

Sunoco spokesman Thomas Golembeski said the size of the oil spill - some of which seeped into the nearby Portage River - was not yet known.

By midday Thursday, crude had stopped leaking from the pipeline and a crew was working to contain the spill, Sunoco said. No injuries were reported.

Industry sources said the pipeline outage was unlikely to affect refinery operations in the Midwest, unless it is prolonged.

Refineries often fed by Maumee's crude include BP's (BP.L) 131,000 bpd plant and Sunoco's 160,000 bpd, both in Toledo, Ohio, and Marathon Oil Corp's (MRO.N) 102,000 bpd Detroit, Michigan refinery.

"The Sunoco pipeline is one of the sources of crude for the (Detroit) refinery," said Linda Casey, a spokeswoman for Marathon.

The Maumee pipeline runs from Lima, Ohio to Samaria, Michigan. (Reporting by Bruce Nichols in Houston, and Janet McGurty and Joshua Schneyer in New York; Editing by Marguerita Choy)