Montgomery County executive candidate David L. Scull has given nearly $67,500 of his own money to his campaign since it began eight months ago, an amount that exceeds both the contributions to him by fellow Democrats and the personal expenditures of his political rivals, according to a report issued yesterday.

Scull released a list of campaign contributors that showed he had raised $36,060 since last September from about 550 supporters, including relatives, political allies on the County Council and his staff. The report also showed that of the $67,497 of his own money, from his own personal $35,000 was injected into the campaign only last week, boosting the total war chest to $103,557. Scull did not report his campaign expenses, except to note he spent $9,472 of his own money on a telephone poll of voters last summer and $525 on computer software.

Scull's personal campaign spending is high even by the standards of Montgomery County, whose wealthy candidates have set statewide records over the years for such out-of-pocket expenses. Two other politicians seeking the county executive's job, Democratic state Sen. Sidney Kramer and Republican Albert Ceccone, have spent $2,000 and $8,000 of their own on their respective primary races, according to the two campaigns.

Democrats Anthony P. Puca and David Robbins and Republican Edward J. Gannon also are running for the executive's job.

Scull yesterday sharply criticized Kramer, his leading rival for the Democratic nomination, for accepting large contributions from business interests, which have helped pushed Kramer's fund-raising total over $185,000.

Kramer, who last reported his campaign finances in November as required by state law, issued a brief statement applauding Scull's disclosure.

A spokeswoman for Kramer said about 1,000 persons had given money to that campaign.

Scull's forebearers forebears, the Lee family, owned a sizable amount of property in Montgomery County, and much of Scull's personal wealth was tied up in that property until last summer.

According to a statement on file with the county, Scull received $484,735 last year when he sold his interests in three real estate ventures in the county. Scull said none of the money from those sales was spent on the campaign, but that some of his "personal resources" had been.